taxonID	type	description	language	source
547E827AFFB2FFA5FF7831AE1663F820.taxon	type_taxon	Type species. Lobatoradarea littoralis Ariyama, sp. nov.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB2FFA5FF7831AE1663F820.taxon	diagnosis	Diagnosis. Body slender, weakly compressed laterally, integument lacking scales; posterodorsal margin of pereonite 7 projected or not, posterodorsal margins of pleonites 1, 2 usually projected. Head with anteroventral corner acutely or slightly produced, rostrum distinct. Antennae long, slender, flagella lacking calceoli; antenna 1 peduncular articles progressively shorter, dorsodistal and ventrodistal corners of article 2 projected, accessory flagellum 1 - articulate; antenna 2 peduncular articles 3 – 5 progressively longer. Mandible, molar triturative, columnar; palp article 2 longer than article 3. Lower lip with inner lobes rounded proximally. Maxilla 1, inner plate with many medial setae, outer plate with many robust setae distally; palp article 1 shorter than article 2, article 2 bearing distal robust setae. Maxilla 2, inner plate wider than outer plate; inner plate with facial row of many setae and medial setae, outer plate bearing distal setae. Coxae medium length, margins usually with small notches; coxa 1 with anterodistal corner rounded, coxa 4 excavated posteroproximally, coxae 5, 6 bilobed; gills present on coxae 2 – 7, oostegites present on female coxae 2 – 5. Gnathopod 1 short, subchelate; propodus as long as or slightly longer than carpus, palm oblique. Gnathopod 2 much longer than gnathopod 1, subchelate, sexual dimorphism indistinct; carpus and propodus elongate, with many short posterior setae, propodus longer than carpus, palm oblique, dactylus short. Pereopods 3 – 7 slender, dactyli smooth or with a minute projection on inner margins; laterodistal margins of bases and ischia in pereopods 3, 4 each with a semicircular lobe; bases of pereopods 5 – 7 lobate, with posterior margins serrated. Epimeral plates 1 – 3, posteroventral corners usually produced. Pleopod 3, peduncle bearing several robust setae on posteromedial surface. Uropods 1 – 3 progressively shorter, outer rami shorter than inner rami; uropods 1, 2 similar, both rami usually with dorsolateral, dorsomedial and terminal robust setae; uropod 3, both rami lanceolate in dorsal view, with dorsolateral and dorsomedial robust setae. Telson longer than wide, entire, but sometimes with 1 – 4 small notches; distal margin rounded or truncated.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB2FFA5FF7831AE1663F820.taxon	etymology	Etymology. From the Latin lobato (= lobate) and Oradarea (closely related genus), referring to the lower lip with inner lobes. Gender: feminine. Included species (11 species). Lobatoradarea angulata Ariyama & Kodama, sp. nov.; L. anko Ariyama & Hoshino, sp. nov.; L. coccina Ariyama, Kohtsuka & Hoshino, sp. nov.; L. inermis Ariyama, Kohtsuka & Kodama, sp. nov.; L. kagoshimensis Ariyama & Kodama, sp. nov.; L. lignorum Ariyama & Moritaki, sp. nov.; L. littoralis Ariyama, sp. nov.; L. longimana (Boeck, 1871), comb. nov.; L. obliquua Ariyama & Kodama, sp. nov.; and L. subinermis Ariyama & Kohtsuka, sp. nov.; and L. thermicola Ariyama & Chen, sp. nov.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB2FFA5FF7831AE1663F820.taxon	discussion	Remarks. The most distinctive character of Lobatoradarea gen. nov. is the presence of inner lobes of the lower lip, and this new genus can be distinguished from Oradarea using this character. The inner lobes are unique in having a shape that is rounded proximally, whereas they are rounded distally in typical amphipods (if present). Oradarea longimana is here transferred to Lobatoradarea owing to exhibiting such a lower lip (Boeck 1876, Shoemaker 1930). Leptamphopus novaezealandiae sensu Nagata (1965) has “ lower lip bearing well developed inner lobes ”, so this species also represents a member of Lobatoradarea. Another distinctive character of the new genus is the gnathopod 2 with elongate carpus and propodus in both sexes. Besides Oradarea, Bouvierella Chevreux, 1900 and Leptamphopus Sars, 1895 in Calliopiidae, the genera Bathyschraderia Dahl, 1959, Djerboa Chevreux, 1906, Luckia Bellan-Santini & Thurston, 1996, and Schraderia Pfeffer, 1888 in Pontogeneiidae Stebbing, 1906 also share such a gnathopod 2. Morphological differences between Lobatoradarea and other related genera are summarized in Table 1. Lobatoradarea is most close to Oradarea, and all the genera except Lobatoradarea never possess such inner lobes of the lower lip. The semicircular lobes on the laterodistal margins of bases and ischia of pereopods 3 and 4 may be also distinctive, and all species of Lobatoradarea including L. longimana have this character, although species of the related genera shown in Table 1 generally do not have the character except for Oradarea shoemakeri Pirlot, 1934 [indistinct] and Luckia striki Bellan-Santini & Thurston, 1996. In addition, the presence of the gill on coxa 7 and the robust setae on pleopod 3 peduncle seems to also be characteristic; however, presence or absence of them have not been noted in all the studies on the related genera.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB2FFA5FF7831AE1663F820.taxon	distribution	Distribution. Only in the Northern Hemisphere: Japan (present study); Arctic (Boeck 1871, Gurjanova 1951), Northwest Atlantic (Shoemaker 1930) and Northeast Pacific (Shaw 1989, Thomas & McCann 1995, Bousfield & Hendrycks 1997). Depth range: 0 – 2200 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	description	(Figs 2 – 6)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	materials_examined	Type material. Holotype: ovigerous female, 4.9 mm (OMNH-Ar- 13204), Tagurasaki coast, Wakayama City, Wakayama Prefecture, 34 ° 16 ' 02 " N, 135 ° 03 ' 39 " E (Fig. 1 F), uppermost subtidal, under stones, 30 June 2007, coll. Hiroyuki Ariyama. Paratypes: 2 ovigerous females, 5.0, 4.4 mm (OMNH-Ar- 13205, 13206), 3 males, 4.4, 3.7, 3.2 mm (OMNH-Ar- 13207 – 13209), same data as holotype; female, 4.2 mm (OMNH-Ar- 13210), Toyokunizaki coast, Misaki Town, Osaka Prefecture, 34 ° 19 ' 22 " N, 135 ° 07 ' 00 " E (Fig. 1 G), 2 m depth, coarse sand bottom with shells, 19 July 2020, coll. Hiroyuki Ariyama. Type locality. Tagurasaki, Wakayama City in Wakayama Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	etymology	Etymology. From the Latin littoralis, - is, - e (= littoral), referring to the habitat. Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	description	Description of female. Based on holotype, ovigerous female, 4.9 mm (OMNH-Ar- 13204) and paratype, ovigerous female, 5.0 mm (OMNH-Ar- 13205) only for maxilla 1. Head (Figs 2, 3). Rostrum developed, lateral cephalic lobe rounded, anteroventral corner slightly projected. Eyes small (diameter: 23 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.6: 0.3; accessory flagellum very short, bullet-shaped, with 4 setae; primary flagellum with 37 + articles, tip lost, article 1 relatively long, 8 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.6: 2.7, each article bearing several robust setae; flagellum long, with 44 + articles, tip lost, article 1 long. Upper lip weakly produced ventrally, bearing many minute setae. Mandibles, incisors with 7 and 10 cusps in left and right, respectively, laciniae mobilis 10 - and 3 - toothed in left and right, respectively, both accessory setal rows with 5 thick setae; palp stout, article length ratio 1.0: 3.5: 2.7, article 1 short, bare, article 2 long, with 3 setae subdistally, article 3 bearing 8 ventral setae and 1 thick and 2 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes, setose mediodistally, ventral surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae; outer plate distally with 11 denticulate robust setae and several thick setae; palp article 1 bare, article 2 apically with 5 triangular and 1 long robust setae and 4 slender setae in left and 9 narrow robust setae and 5 slender setae in right. Maxilla 2, inner plate ca. 1.2 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 10 short robust setae mediodistally; palp article 3 dorsal surface with 4 thick setae and many fine setae. Pereon (Figs 2, 4). Pereonite 7 not projected posterodorsally. Gnathopod 1 short; coxa subrectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing 6 setae; basis slender, straight, anterior margin lined with short setae, posterior margin bearing 2 long setae, medial surface with several setae; merus acutely projected distally, with several thick setae on posterodistal margin; carpus relatively long, posterior margin bearing many thick setae; propodus slightly shorter than carpus (ca. 0.9 times), posterior margin weakly sinuate, with several thick setae, palm weakly oblique, defined by 2 (1 lateral and 1 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish rectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing 3 setae; basis slender, straight, anterior margin lined with short setae, posterior margin bearing 1 long and 5 short setae; merus acutely projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.1 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 2 (1 lateral and 1 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish trapezoidal, with a small notch each on anteroventral and posteroventral margins, medial surface bearing 5 setae; basis slightly curved anteriorly, anterior margin and anterodistal corner each with 3 robust setae, posteroproximal margin with 3 slender setae, posterodistal corner bearing a robust seta; merus anterodistal corner with a robust seta; carpus posterior margin with 2 robust setae; propodus longer than carpus, posterior margin with 4 robust setae; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin slightly angular, with 2 and 5 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing several setae; basis slightly curved anteriorly, anterior margin and anterodistal corner with 1 and 2 robust setae, respectively, posteroproximal margin with 3 slender setae, posterodistal corner bearing a robust seta; ischium – dactylus similar to those of pereopod 3. Pereopod 5 almost same length as pereopod 4; coxa posterior margin with 2 small notches, medial surface with a few setae anteroventrally; basis ovoid, with anterolateral ridge, anterior margin with a proximal seta and 6 robust setae, anterodistal corner bearing 2 robust setae, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus with 1 + 2 + 2 + 1 anterior, 3 anterodistal, 2 posterior and 5 posterodistal robust setae; carpus with 1 + 2 + 2 anterior, 5 anterodistal, 3 posterior and 5 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 anterior, 2 anterodistal and 2 + 2 + 2 posterior robust setae; dactylus with a minute projection. Pereopod 6 about 1.2 times as long as pereopod 5; coxa anterior margin straight, with 4 setae, posteroventral margin with 6 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 4 robust setae, anterodistal corner bearing 3 robust setae, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus with 2 + 2 + 2 anterior, 3 anterodistal, 4 posterior and 6 posterodistal robust setae; carpus with 2 + 2 + 2 anterior, 5 anterodistal, 1 + 2 posterior and 5 posterodistal robust setae; propodus with 1 + 2 + 2 + 2 + 2 anterior, 3 anterodistal and 2 + 2 + 2 posterior robust setae; dactylus with a minute projection. Pereopod 7 about 1.1 times as long as pereopod 6; coxa short, oval, posteroventral margin with 4 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 5 robust setae, anterodistal corner bearing 2 robust setae, posterior margin minutely serrated, medial surface with short vertical ridge bearing a robust seta; merus with 1 + 2 + 3 + 1 anterior, 3 anterodistal, 3 posterior and 5 posterodistal robust setae; carpus with 1 + 3 + 3 + 2 anterior, 5 anterodistal, 2 + 1 + 2 posterior and 6 posterodistal robust setae; propodus with 1 + 2 + 2 + 2 + 2 + 2 anterior, 2 anterodistal and 2 + 2 + 2 posterior robust setae; dactylus with a minute projection. Pleon (Figs 2, 5). Pleonites 1, 2 projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced in plates 1, 3 and strongly produced in plate 2, lateral surfaces with ridge, ventral margins bare. Pleopods, pleopod 2 longest; each peduncle bearing several setae and 2 coupling hooks, peduncle of pleopod 1 with a robust seta posteromedially, peduncle of pleopod 3 bearing 4 posteromedial and 1 lateral robust setae; outer rami longer than inner rami, both rami with 12 – 13 articles (11 articles in outer ramus of pleopod 1 owing to regeneration). Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 4 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.65 times length of peduncle, with 4 lateral and 4 terminal robust setae; inner ramus ca. 1.4 times as long as outer ramus, with 5 lateral, 4 (1 lost) medial and 4 terminal robust setae. Uropod 2 about 0.85 times as long as uropod 1; peduncle short, with 3 lateral, 1 laterodistal and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.7 times length of peduncle, with 2 lateral and 4 (1 lost) terminal robust setae; inner ramus about twice as long as outer ramus, with 4 lateral, 4 medial and 4 terminal robust setae. Uropod 3 about 0.8 times length of uropod 2; peduncle very short, longer than wide, ventrodistal end slightly produced, lateral margin with 2 short setae; outer ramus ca. 1.6 times length of peduncle, with 4 lateral and 4 medial robust setae; inner ramus about 1.55 times as long as outer ramus, with 9 lateral and 11 medial robust setae. Telson small, trapezoidal, distal margin truncated, dorsal surface with 6 sensory setae, lateral margins bearing a few minute setae. Description of male. Based on paratype, male, 4.4 mm (OMNH-Ar- 13207). Almost similar to holotype, ovigerous female, 4.9 mm (OMNH-Ar- 13204) except for oostegites. Gnathopods resembling those of female; but gnathopod 1 basis with inner long seta and propodus slightly shorter than carpus (ca. 0.95 times, Fig. 5 M-G 1), and gnathopod 2 basis lacking posterior long seta (Fig. 5 M-G 2). Coloration in life. Based on paratype, female, 4.2 mm (OMNH-Ar- 13210, Fig. 6). Head faintly-orangish white, eyes bright red; pereonites, pleonites and coxae orangish white with orange margins; antennae orangish white; gnathopods and pereopods white except for orange bases of pereopods 5 – 7; pleopods and uropods white.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	discussion	Remarks. Lobatoradarea littoralis sp. nov. is characterized by the strongly produced posteroventral corner of the epimeral plate 2. This character is shared with L. kagoshimensis sp. nov. in the other Lobatoradarea species; however, this new species can be distinguished from L. kagoshimensis by the slightly projected anteroventral corner of the head and the small eyes. Habitat. Under stones or in coarse sand in the shallow subtidal zone (0 – 2 m depth).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFB0FFADFF7831AE14F1FE9B.taxon	distribution	Distribution. Japan: from Tagurasaki in Wakayama Prefecture to Toyokunizaki in Osaka Prefecture (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	description	(Figs 7 – 11)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	materials_examined	Type material. Holotype: female, 6.4 mm (OMNH-Ar- 13211), mouth of Koajiro Bay, Miura City, Kanagawa Prefecture, 35 ° 09 ' 55 " N, 139 ° 36 ' 43 " E (Fig. 1 C), 10 – 12 m depth, mud bottom, using dredge, 26 February 2015, coll. Hisanori Kohtsuka. Paratypes: ovigerous female, 4.6 mm (OMNH-Ar- 13212) and male, 4.0 mm (OMNH- Ar- 13213), Akinohama Beach, Izu Ōshima Island, Tokyo, 34 ° 47 ' 14 " N, 139 ° 24 ' 31 " E (Fig. 1 D), 15 – 20 m depth, accumulated red algae, using SCUBA diving, 2 April 2024, coll. Osamu Hoshino; 2 ovigerous females, 6.3, 5.3 mm (OMNH-Ar- 13214, 13215) and male, 3.7 mm (OMNH-Ar- 13216), 13 March 2025, other data same as paratypes (OMNH-Ar- 13212, 13213). Type locality. Mouth of Koajiro Bay, Miura City in Kanagawa Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	etymology	Etymology. From the Latin coccineus, - a, - um (= scarlet), referring to the body color. Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	description	Description of female. Based on holotype, 6.4 mm (OMNH-Ar- 13211). Head (Figs 7, 8). Rostrum strongly developed, lateral cephalic lobe roundish-angular, anteroventral corner acutely projected. Eyes medium-sized (diameter: 38 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.6: 0.3; accessory flagellum very short, bullet-shaped, with 4 setae; primary flagellum with 42 + articles, tip lost, article 1 relatively long, 11 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.1: 2.7, each article bearing several robust setae; flagellum with 15 + articles, distal part lost, article 1 long. Upper lip weakly produced ventrally, bearing many thin setae. Mandibles, both incisors with 9 cusps, laciniae mobilis 7 - and 3 - toothed in left and right, respectively, accessory setal rows with 5 and 4 thick setae in left and right, respectively; palp stout, article length ratio 1.0: 3.2: 2.0 in right, article 1 short, bare, article 2 long, with 3 setae subdistally, article 3 bearing 1 proximal, 10 ventral and 1 thick and 2 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes, setose mediodistally, ventral surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae; outer plate distally with 11 denticulate robust setae and several thick setae; palp article 1 bare, article 2 apically with 6 triangular and 2 long robust setae and 5 slender setae in left and 7 narrow robust setae and 4 slender setae in right. Maxilla 2, inner plate ca. 1.4 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 9 short robust setae mediodistally; palp article 3 dorsal surface with 5 thick setae and many fine setae. Pereon (Figs 7, 9). Pereonite 7 with strong projection posterodorsally. Gnathopod 1 short; coxa subrectangular, with a small notch on posteroventral margin, medial surface bearing many setae; basis slender, straight, proximal part with many setae anteromedially and posterolaterally; merus acutely projected posterodistally, with several thick setae on mid-posterior margin; carpus relatively long, posterior margin bearing many thick setae; propodus slightly shorter than carpus (ca. 0.95 times), posterior margin with several bundles of thick setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa rectangular, with 1 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing several setae; basis slender, straight, anterior margin lined with short setae, posterior and posterolateral margins bearing several long setae; merus acutely projected posterodistally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.1 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish trapezoidal, with 5 small notches each on anteroventral and posteroventral margins, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin lacking robust setae, posteroproximal margin with several slender setae; merus anterodistal corner with a robust seta; carpus posterior margin with 4 robust setae; propodus longer than carpus, posterior margin with 1 + 1 + 1 + 1 + 2 + 1 robust setae; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin slightly angular, with 3 and 9 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin lacking robust setae, anterodistal corner with a robust seta, anteroproximal and posteroproximal margins with several slender setae; ischium – dactylus similar to those of pereopod 3. Pereopod 5 longer than pereopod 4; coxa anteroventral and posterior margins with 2 and 7 small notches, respectively, medial surface setose anteriorly; basis ovoid, with anterolateral ridge, anteroproximal part setose laterally and medially, anterior margin and anterodistal corner with 5 and 2 robust setae, respectively, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium lacking a robust seta; merus with 1 + 1 + 2 anterior, 3 anterodistal, 1 + 1 + 2 + 1 posterior and 3 posterodistal robust setae; carpus with 1 + 3 + 2 + 2 anterior, 1 anterodistal, 1 + 1 + 2 + 1 posterior and 3 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 + 2 anterior, 3 anterodistal and 1 + 1 + 1 + 2 + 1 posterior robust setae; dactylus with a minute projection. Pereopod 6 longer than pereopod 5; coxa anterior margin straight, with many setae, posteroventral margin with 8 small notches; basis ovoid, with anterolateral ridge, anteroproximal part with several lateral setae and 2 medial thick setae, anterior margin and anterodistal corner with 5 and 1 robust setae, respectively, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium without a robust seta; merus with 3 anterior, 1 anterodistal, 1 + 1 + 1 + 1 + 2 + 1 + 1 posterior and 3 posterodistal robust setae; carpus with 2 + 2 + 2 + 1 + 2 anterior, 4 anterodistal, 1 + 1 + 2 + 3 + 1 posterior and 5 posterodistal robust setae; propodus with 1 + 2 + 2 + 2 + 2 + 2 anterior, 3 anterodistal and 1 + 1 + 1 + 1 + 1 + 3 posterior robust setae; dactylus with a minute projection. Pereopod 7 slightly longer than pereopod 6; coxa short, anterior margin straight, with many setae, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anteroproximal part with several setae laterally and medially, anterior margin and anterodistal corner with 4 and 2 robust setae, respectively, posterior margin minutely serrated, medial surface with short vertical ridge bearing a robust seta; merus with 1 + 2 + 2 + 2 anterior, 3 anterodistal, 1 + 1 + 2 + 1 posterior and 5 posterodistal robust setae; carpus with 1 + 2 + 2 + 1 anterior, 4 anterodistal, 1 + 2 + 1 + 1 + 1 posterior and 5 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 + 2 + 1 anterior, 2 anterodistal and 1 + 1 + 1 + 2 + 1 posterior robust setae; dactylus with a minute projection. Pleon (Figs 7, 10). Pleonites 1, 2 strongly projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces with ridge, ventral margins of plates 2, 3 bearing 1 and 3 robust setae, respectively. Pleopods, each peduncle bearing several or many setae and 2 coupling hooks, peduncle of pleopods 1, 2 with 3 – 4 posterior robust setae, peduncle of pleopod 3 bearing 5 posterior and 1 lateral robust setae; all rami damaged. Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 5 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.8 times length of peduncle, with 4 (1 lost) lateral and 4 (1 lost) terminal robust setae; inner ramus damaged, with lateral and medial robust setae. Uropod 2 shorter than uropod 1; peduncle short, with 3 (2 lost) lateral, 1 laterodistal, 2 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.9 times length of peduncle, with 3 (1 lost) lateral and 4 (2 lost) terminal robust setae; inner ramus damaged, with lateral and medial robust setae. Uropod 3 relatively long; peduncle very short, longer than wide, ventrodistal end produced, lateral and ventral margins each with 3 short setae; outer ramus ca. 2.05 times length of peduncle, with 4 lateral and 3 medial robust setae; inner ramus about 1.55 times as long as outer ramus, with 7 lateral and 13 medial robust setae. Telson small, trapezoidal, distal margin rounded, with a small notch in right, dorsal surface with 6 sensory setae, lateral margins with several minute setae. Description of male. Based on paratype, male, 4.0 mm (OMNH-Ar- 13213). Almost similar to holotype, ovigerous female, 6.4 mm (OMNH-Ar- 13211) except for oostegites. Gnathopods resembling those of female; but coxae with a small notch each on anteroventral and posteroventral margins, both coxae and bases less setose, gnathopod 1 propodus slightly longer than carpus (ca. 1.05 times, Fig. 10 M-G 1), and gnathopod 2 palm defined by 3 (2 lateral and 1 medial) short robust setae (Fig. 10 M-G 2). Coloration in life. Based on holotype, female, 6.4 mm (OMNH-Ar- 13211, Fig. 11). Head light red, but translucent around eyes, eyes pink; pereonites, pleonite 1, ventral parts of pleonites 2, 3, coxae and bases of pereonites 5 – 7 bright red with sparse white spots; dorsal parts of pleonites 2, 3 white, urosomites and uropods pale pink; peduncles of antennae light red, flagellum white; gnathopods pale pink, pereopods except for pereopods 5 – 7 bases red and white.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	discussion	Remarks. Lobatoradarea coccina sp. nov. is characterized by a combination of the acutely projected anteroventral corner of the head and the strong projection on the pereonite 7. All other known species of the new genus Lobatoradarea do not exhibit this combination. The scarlet coloration is also distinctive. Habitat. On mud bottom or among algae in the shallow subtidal zone (10 – 20 m depth).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFBAFFB3FF78308F1580FE9B.taxon	distribution	Distribution. Japan: mouth of Koajiro Bay, Miura City in Kanagawa Prefecture, and Izu Ōshima Island in Tokyo (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	description	(Figs 12 – 16)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	materials_examined	Type material. Holotype: ovigerous female, 5.5 mm (OMNH-Ar- 13217), Akinohama Beach, Izu Ōshima Island, Tokyo, 34 ° 47 ' 14 " N, 139 ° 24 ' 31 " E (Fig. 1 D), 15 – 20 m depth, accumulated red algae, using SCUBA diving, 13 March 2025, coll. Osamu Hoshino. Paratypes: female, 3.7 mm (OMNH-Ar- 13218) and 2 males, 4.0, 3.9 mm (OMNH- Ar- 13219, 13220), same data as holotype; female 5.0 mm (OMNH-Ar- 13221), 24 March 2025, other data same as holotype. Type locality. Akinohama, Izu Ōshima Island in Tokyo, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	etymology	Etymology. Anko refers to the women of Izu Ōshima Island wearing traditional kimonos. This word was made famous by a popular Japanese song by Harumi Miyako titled “ Anko-tsubaki-wa-koinohana ” (1964). Used as noun in apposition.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	description	Description of female. Based on holotype, ovigerous female, 5.5 mm (OMNH-Ar- 13217) and paratype, female, 5.0 mm (OMNH-Ar- 13221) only for gnathopod 2 and epimeral plates. Head (Figs 12, 13). Rostrum well developed, lateral cephalic lobe rounded, anteroventral corner slightly projected. Eyes small (diameter: 25 % of head height). Antenna 1 very long; peduncular articles 1 – 3 with length ratio of 1.0: 0.6: 0.2; accessory flagellum very short, bullet-shaped, with 1 long and 4 short setae; primary flagellum with 57 articles, article 1 relatively long, 2 articles with aesthetasc. Antenna 2, peduncular articles 3, 4 with length ratio of 1.0: 2.2, each article bearing several robust setae; peduncular article 5 and flagellum lost. Upper lip weakly produced ventrally, anterior surface and ventral margin bearing many minute setae. Mandibles, incisors with 9 and 8 cusps in left and right, respectively, laciniae mobilis 9 - and 3 - toothed in left and right, respectively, left accessory setal row with 5 thick and 5 slender setae, right accessory setal row bearing 4 thick and 1 slender setae; palp stout, article length ratio 1.0: 3.4: 2.2 in left, article 1 short, bare, article 2 long, with 3 setae subdistally, article 3 bearing 1 proximal, 10 ventral and 1 thick and 3 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes minutely setose proximally, distal parts of outer lobes with many slender and fine setae, middle parts bearing sparse fine setae ventrally and laterally. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae, tip with 1 long and 4 short setae; outer plate distally with 11 denticulate robust setae, mediodistal margin bearing 6 thick and many slender setae; palp article 1 bare, article 2 apically with 7 triangular and 1 long robust setae and 4 slender setae in left and 9 narrow robust setae and 6 slender setae in right. Maxilla 2, inner plate ca. 1.4 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 5 long and 12 short robust setae mediodistally; palp article 3 dorsal surface with 5 thick setae and many fine setae. Pereon (Figs 12, 14). Pereonite 7 not projected posterodorsally. Gnathopod 1 short; coxa roundish, with a small notch each on anteroventral and posteroventral margins, medial surface bearing several setae; basis slender, straight, anterior margin lined with robust setae, posterior margin and lateral surface bearing 3 and 2 long setae, respectively, medial surface with 7 long setae; merus acutely projected distally, with several thick setae on posterodistal margin, posterolateral surface minutely setose in middle; carpus relatively long, posterior margin bearing many thick setae; propodus slightly shorter than carpus (ca. 0.95 times), posterior margin with many thick setae, palm weakly oblique, defined by 2 (1 lateral and 1 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish rectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing 4 setae; basis slender, straight, anterior margin with 3 robust setae and 6 slender setae, posterior margin and lateral surface bearing 6 and 2 long setae, respectively; merus acutely projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.3 times), narrow, anterior margin lined with slender setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 2 (1 lateral and 1 medial) short robust setae; dactylus short. Pereopod 3, coxa roundish rectangular, with a small notch each on anteroventral and posteroventral margins, medial surface without setae; basis slightly curved anteriorly, anterior margin and anterodistal corner with 3 and 2 robust setae, respectively, posteroproximal margin with a few slender setae, posterior margin and posterodistal corner bearing 2 and 1 robust setae, respectively; merus anterodistal corner with 1 long and 1 short robust setae; carpus – dactylus lost. Pereopod 4, coxa ventral margin rounded, with 1 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bare; basis – merus similar to those of pereopod 3. Pereopod 5, coxa anteroventral and posterior margins with 2 and 4 small notches, respectively; basis ovoid, with anterolateral ridge, anterior margin with a few proximal seta and 4 short robust setae, anterodistal corner bearing a robust seta, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus with 2 + 2 + 1 anterior, 4 anterodistal, 2 posterior and 3 posterodistal robust setae; carpus with 1 + 2 + 2 anterior, 3 anterodistal, 2 posterior and 2 posterodistal robust setae; propodus with 1 + 2 + 2 + 2 anterior, 4 anterodistal and 2 + 2 + 2 posterior robust setae; dactylus with a minute projection. Pereopod 6 about 1.2 times as long as pereopod 5; coxa anterior margin straight, with a seta, posteroventral margin with 5 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 4 robust setae, anterodistal corner bearing a robust seta, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus with 2 + 2 + 2 anterior, 3 anterodistal, 3 posterior and 5 posterodistal robust setae; carpus with 2 + 2 + 2 anterior, 5 anterodistal, 2 + 2 posterior and 5 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 + 2 anterior, 2 anterodistal and 2 + 2 + 2 posterior robust setae; dactylus with a minute projection. Pereopod 7 about 1.1 times as long as pereopod 6; coxa short, oval, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 5 robust setae, anterodistal corner bearing a robust seta, posterior margin minutely serrated, medial surface with short vertical ridge bearing a robust seta; ischium with a thick seta at anterodistal corner; merus with 2 + 2 + 3 anterior, 3 anterodistal, 3 posterior and 4 posterodistal robust setae; carpus with 2 + 2 + 2 + 3 anterior, 5 anterodistal, 2 + 2 + 2 posterior and 4 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 + 2 + 2 anterior, 2 anterodistal and 2 + 2 + 2 + 3 posterior robust setae; dactylus with a minute projection. Pleon (Figs 12, 15). Pleonites 1, 2 projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces in plates 1, 2 with ridge, ventral margins in plates 2, 3 each bearing 2 robust setae. Pleopods, pleopod 2 longest; each peduncle bearing a few short setae and 2 coupling hooks, peduncles of pleopods 1 – 3 with 3, 2 and 5 posteromedial robust setae, respectively, peduncle of pleopod 3 also bearing a lateral robust seta; both rami almost same length, with 13 – 15 articles. Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 4 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.6 times length of peduncle, with 3 lateral and 3 terminal robust setae; inner ramus ca. 1.65 times as long as outer ramus, with 4 lateral, 4 medial and 4 terminal robust setae. Uropod 2 about 0.9 times as long as uropod 1; peduncle short, with 3 lateral, 1 laterodistal and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.8 times length of peduncle, with 3 lateral and 3 terminal robust setae; inner ramus about ca. 2.2 times as long as outer ramus, with 6 lateral, 6 medial and 4 terminal robust setae. Uropod 3 about 0.85 times length of uropod 2; peduncle very short, longer than wide, ventrodistal end triangularly produced, ventral margin with 4 short setae; outer ramus ca. 1.85 times length of peduncle, with 5 lateral and 3 medial robust setae; inner ramus about 1.6 times as long as outer ramus, with 8 lateral and 10 medial robust setae. Telson small, trapezoidal, distal margin truncated, with a small notch in right side, dorsal surface bearing 6 sensory setae, margins with 9 minute setae. Description of male. Based on paratype, male, 4.0 mm (OMNH-Ar- 13219) and paratype, male, 3.9 mm (OMNH-Ar- 13220). Almost similar to holotype, ovigerous female, 5.5 mm (OMNH-Ar- 13217) except for oostegites. Gnathopods resembling those of female; but medial surfaces of coxae and bases less setose (Fig. 15 M 1 - RC 1, M 2 - RG 1 and M 2 - RG 2). Coloration in life. Based on paratype, female, 5.0 mm (OMNH-Ar- 13221, Fig. 16). Head white, eyes bright red; pereonite 1 white with dark red anterior and posterior margins, pereonite 2 – 6 white with dark red posterior margins, pereonite 7 and pleonites 1, 2 white with dark red dorsal band (faint in pleonite 2) and dark red posterolateral point, pleonite 3 and urosomites 1 – 3 white; antennae white with pale red distal margin of peduncular articles; coxae white with dark red anterior or posterior margin, basis of pereopod 5 mostly dark red, other parts of pereopods, pleopods and uropods white or faintly pink.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	discussion	Remarks. Only two species have small eyes in Lobatoradarea gen. nov.: L. anko sp. nov. and L. littoralis sp. nov. This new species can be distinguished from L. littoralis by the minutely produced posteroventral corner of the epimeral plate 2 (that of L. littoralis is strongly produced). Habitat. Among algae in the shallow subtidal zone (15 – 20 m depth).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA4FFB9FF78308F17B7FD9F.taxon	distribution	Distribution. Japan: Izu Ōshima Island in Tokyo (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	description	(Figs 17 – 21)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	materials_examined	Type material. Holotype: ovigerous female, 5.1 mm (OMNH-Ar- 13222), Kagoshima Bay, off Yojirō, Kagoshima City, Kagoshima Prefecture, 31 ° 33 ' 27 " N, 130 ° 33 ' 49 " E (Fig. 1 I), 21 – 23 m depth, fish reef on sandy-mud bottom, using bait trap, 6 August 2021, coll. Midori Matsuoka. Paratypes: ovigerous female, 5.1 mm (OMNH-Ar- 13223, not dissected), ovigerous female, 4.2 mm (OMNH-Ar- 13224), 2 females, 4.3, 3.6 mm (OMNH-Ar- 13225, 13226), 3 males, 4.0, 3.9, 3.7 mm (OMNH-Ar- 13227 – 13229), same data as holotype. Type locality. Off Yojirō, Kagoshima City in Kagoshima Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	etymology	Etymology. Referring to the type locality.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	description	Description of female. Based on holotype, ovigerous female, 5.1 mm (OMNH-Ar- 13222), and paratype, ovigerous female, 4.2 mm (OMNH-Ar- 13224) for antenna 2. Head (Figs 17, 18). Rostrum strongly developed, lateral cephalic lobe roundish-angular, anteroventral corner moderately projected. Eyes large (diameter: 47 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.8: 0.2; accessory flagellum very short, cone-shaped, with 5 setae; primary flagellum with 27 + articles, tip lost, article 1 long, 8 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.4: 3.1, each article bearing several robust setae; flagellum, most part lost, article 1 long. Upper lip relatively long, produced ventrally, anterior surface and ventral margin with many minute setae. Mandibles, both incisors with 7 cusps, laciniae mobilis 8 - and 3 - toothed in left and right, respectively, both accessory setal rows with 4 thick setae; palp stout, article length ratio 1.0: 3.5: 2.1 in left, article 1 short, bare, article 2 long, with 3 – 4 setae subdistally, article 3 bearing 1 proximal, 8 ventral and 2 thick and 2 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes, setose mediodistally, ventrodistal surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae, tip with a long thick seta; outer plate distally with 11 denticulate robust setae and 7 thick setae; palp article 1 bare, article 2 apically with 6 triangular and 1 long robust setae and 4 slender setae in left and 7 narrow robust setae and 4 slender setae in right. Maxilla 2, inner plate ca. 1.5 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 5 long and 12 short robust setae mediodistally; palp article 3 dorsal surface with 4 thick setae and many fine setae. Pereon (Figs 17, 19). Pereonite 7 not projected posterodorsally. Gnathopod 1 small; coxa subrectangular, with 2 small notches each on anteroventral and posteroventral margins, medial surface bearing several setae; basis slender, straight, anterior margin lined with short setae, posteroproximal margin bearing 4 long setae, lateral and medial surfaces setose; merus acutely projected distally, with several thick setae on posterodistal margin; carpus relatively long, posterior margin bearing many thick setae; propodus slightly shorter than carpus (ca. 0.9 times), posterior margin with several thick setae, palm weakly oblique, defined by 3 (1 lateral and 2 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish rectangular, with 1 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing 5 setae; basis slender, straight, anterior margin with a few short setae, posterior margin bearing 1 long and 2 short setae; merus acutely projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.2 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish rectangular, with 3 and 1 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin with 3 robust setae, posteroproximal margin with 4 slender setae; merus anterodistal corner with a long robust seta; carpus posterior margin with 5 robust setae; propodus longer than carpus, posterior margin with 5 robust setae; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin rounded, with 5 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin with 2 robust setae, posteroproximal margin with 4 slender setae; ischium – dactylus similar to those of pereopod 3. Pereopod 5, coxa anteroventral and posterior margins with 3 and 5 small notches, respectively; basis longish ovoid, anterolateral ridge indistinct, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing 2 robust setae, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus – dactylus lost. Pereopod 6, coxa anterior margin straight, with a seta, posteroventral margin with 6 small notches; basis longish ovoid, with anterolateral ridge, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with a slender seta at anterodistal corner; merus with 1 + 2 + 2 + 2 anterior, 2 anterodistal, 3 posterior and 2 posterodistal robust setae; carpus – dactylus lost. Pereopod 7, coxa short, oval, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anterior margin with many proximal setae and 4 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta (damaged); merus with 1 + 1 + 2 anterior, 3 anterodistal, 4 posterior and 3 posterodistal robust setae; carpus – dactylus lost. Pleon (Figs 17, 20). Pleonites 1, 2 acutely projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced in plates 1, 3 and strongly produced in plate 2, lateral surfaces with ridge in plates 1, 2, ventral margins bearing 1 and 2 robust setae in plates 2 and 3, respectively. Pleopods, pleopod 2 longest; each peduncle bearing several setae and 2 coupling hooks, peduncles with 1, 2 and 5 robust setae posteromedially in pleopods 1 – 3, respectively, peduncle of pleopod 3 also bearing a lateral robust seta; outer rami with 14 articles, inner rami with 15, 14 and 12 articles, respectively. Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 5 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus damaged, with 2 + (1 lost) lateral robust setae; inner ramus ca. 0.9 times as long as peduncle, with 3 lateral, 3 medial and 4 terminal robust setae. Uropod 2 about 0.9 times as long as uropod 1; peduncle short, with 3 lateral, 1 laterodistal, 1 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.75 times length of peduncle, with 2 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 2.2 times as long as outer ramus, with 5 lateral, 4 medial and 4 terminal robust setae. Uropod 3 about 0.9 times length of uropod 2; peduncle very short, longer than wide, ventrodistal end acutely produced, dorsal and ventral surfaces with several setae, posterodistal corner bearing a seta; outer ramus ca. 1.65 times length of peduncle, with 4 lateral and 3 medial robust setae; inner ramus about 1.6 times as long as outer ramus, with 8 (2 lost) lateral and 11 medial robust setae. Telson small, trapezoidal, distal margin truncated, dorsal surface with pair of 2 + 1 sensory setae, each lateral margin bearing 4 minute setae. Description of male. Based on paratype, male, 4.0 mm (OMNH-Ar- 13227). Almost similar to holotype, ovigerous female, 5.1 mm (OMNH-Ar- 13222) except for oostegites. Gnathopods resembling those of female; but gnathopod 1 coxa with a small notch each on anteroventral and posteroventral corners, basis slightly setose, with medial long seta (Fig. 20 M-G 1), and gnathopod 2 coxa bearing a small notch each on anteroventral and posteroventral corners, propodus posterodistal corner with 3 (2 lateral and 1 medial) short robust setae (Fig. 20 M-G 2). Coloration in life. Based on paratype, ovigerous female, 5.1 mm (OMNH-Ar- 13223, Fig. 21). Head pale orange with orange posterior margin, eyes bright red; pereonites, pleonites and coxae pale orange with orange margins, lateral surfaces of pleonites 1, 2 each with distinct orange mark mid-posteriorly; antennae peduncles pale orange to white with orange distal margins, flagella faintly-orangish white; gnathopods, pereopods, pleopods and uropods faintly-orangish white, but bases and meri of pereopods 5 – 7 partly orange.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	discussion	Remarks. Lobatoradarea kagoshimensis sp. nov. is characterized by a combination of the large eyes and the strongly produced posteroventral corner of the epimeral plate 2. This combination is unique in the genus. Habitat. Fish reef on sandy-mud bottom with a depth of 21 – 23 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFAEFFBFFF78338B1029FCEB.taxon	distribution	Distribution. Japan: Kagoshima Bay in Kagoshima Prefecture (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	description	(Figs 22 – 26)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	materials_examined	Type material. Holotype: male, 5.0 mm (OMNH-Ar- 13230), Sagami Bay, off Miura City, Kanagawa Prefecture, 35 ° 09 ' 07 " N, 139 ° 34 ' 29 " E (Fig. 1 A), 84 – 91 m depth, using dredge, 9 May 2016, coll. Hisanori Kohtsuka. Paratype: female, 4.6 mm (OMNH-Ar- 13231), same data as holotype; male, 4.8 mm (OMNH-Ar- 13232), mouth of Kagoshima Bay, between Ibusuki City and Minami-ōsumi Town, Kagoshima Prefecture, 31 ° 12 ' 47 " N, 130 ° 42 ' 21 " E (Fig. 1 J), 108 – 109 m depth, muddy bottom, using dredge, T / V Nansei-maru (Kagoshima University), 2 October 2024, coll. Masafumi Kodama. Type locality. Sagami Bay, off Miura City in Kanagawa Prefecture Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	etymology	Etymology. From the Latin inermis, - is, - e (= unarmed), referring to the body lacking posterodorsal projections. Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	description	Description of male. Based on holotype, 5.0 mm (OMNH-Ar- 13230). Head (Figs 22, 23, 25 A 2). Rostrum developed, lateral cephalic lobe roundish triangular, anteroventral corner slightly projected. Eyes large (diameter: 51 % of head height), bulging laterally. Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.8: 0.3, articles 1, 2 with a few robust setae; accessory flagellum short, cylindrical, tip with 4 setae; primary flagellum with 29 + articles, tip lost, article 1 relatively long, 1 article with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.5: 3.1, each article bearing several robust setae; flagellum long, with 32 + articles, tip lost, article 1 long. Upper lip weakly produced ventrally, bearing many thin setae ventrally. Mandibles, both incisors with 8 cusps, laciniae mobilis 7 - and 3 - toothed in left and right, respectively, both accessory setal rows with 6 thick setae; palp stout, article length ratio 1.0: 3.2: 2.9 in right, article 1 short, bare, article 2 long, with 6 – 7 setae ventrally, article 3 bearing 1 proximal, 11 ventral and 1 long and 2 short distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively short mandibular lobes, setose mediodistally. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae; outer plate distally with 11 denticulate robust setae and 8 thick setae; palp article 1 bare, article 2 apically with 7 triangular and 1 long robust setae and 4 slender setae in left and 9 narrow robust setae and 5 slender setae in right. Maxilla 2, inner plate ca. 1.4 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 5 long and 7 short robust setae mediodistally; palp article 3 dorsal surface with 3 thick setae and many fine setae. Pereon (Figs 22, 24). Pereonite 7 not projected posterodorsally. Gnathopod 1 short; coxa subrectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing several setae; basis slender, straight, anterior margin with 6 robust setae and a few slender setae, posterior margin bearing 1 long and several short setae, medial surface with 3 long setae; merus projected distally, with several thick setae on posterodistal margin; carpus relatively short, posterior margin bearing many thick setae; propodus longer than carpus (ca. 1.25 times), posterior margin setose, palm weakly oblique, defined by 1 long and 3 short robust setae (2 lateral and 2 medial); dactylus short. Gnathopod 2 longer than gnathopod 1; coxa roundish rectangular, with a small notch on anteroventral margin and a small notch and robust seta on posteroventral margin; basis slender, straight, anterior margin with 8 robust setae, posterior margin bearing 3 long and several short setae; merus projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.1 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3, coxa roundish rectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing 5 thick and 1 slender setae; basis almost straight, anterior margin with 6 robust setae, posterior margin lined with short setae, lateral surface bearing 2 thick setae proximally; merus slightly widened distally, anterior margin with 3 robust setae, anterodistal corner with 3 robust setae; carpus – dactylus lost. Pereopod 4, coxa ventral margin rounded, with 2 small notches each on anteroventral and posteroventral margins, medial surface bearing a few setae; basis almost straight, anterior and posterior margins with 4 and 3 robust setae, respectively; ischium and merus similar to those of pereopod 3, carpus – dactylus lost. Pereopod 5, coxa anterodistal corner and posterior margin with 1 and 5 small notches, respectively; basis ovoid, anterolateral ridge indistinct, anterior margin with 3 proximal setae and 1 + 1 + 2 + 3 + 2 robust setae, anterodistal corner bearing 3 robust setae, posterior margin sparsely serrated, medial surface with vertical ridge bearing a small robust seta; ischium with 2 robust setae at anterodistal corner; merus with 2 + 2 anterior, 2 anterodistal, 4 posterior and 2 posterodistal robust setae; carpus – dactylus lost. Pereopod 6, coxa anterior margin straight, without setae, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 1 + 1 + 2 robust setae, anterodistal corner bearing 2 robust setae, posterior margin sparsely serrated, medial surface with vertical ridge bearing a seta; ischium with 2 robust setae at anterodistal corner; merus with 2 + 2 + 2 anterior, 2 anterodistal, 2 + 2 + 2 + 2 posterior and 1? posterodistal robust setae; carpus with 2 anterior and 2 anterodistal robust setae; propodus with 4 anterior, 1 anterodistal and 4 posterior robust setae; dactylus smooth. Pereopod 7, coxa short, trapezoidal, posteroventral margin with a small notch; basis ovoid, with anterolateral ridge, anterior margin with 2 proximal setae and 1 + 1 + 2 robust setae, posterior margin sparsely serrated, medial surface with short vertical ridge bearing 2 short setae; merus with 1 + 2 + 2 anterior, 3 anterodistal, 1 + 2 + 1 + 1 + 1 posterior and 7 posterodistal robust setae; carpus – dactylus lost. Pleon (Figs 22, 25). Pleonites 1, 2 lacking posterodorsal projections. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces with ridge in plates 1, 2, ventral margins with 2, 3, 2 robust setae in plates 1 – 3, respectively. Pleopods, pleopod 2 longest; each peduncle bearing a few or several setae and 2 coupling hooks, peduncle of pleopod 1 with a robust seta posteromedially, peduncle of pleopod 2 with a long distal seta, peduncle of pleopod 3 bearing 3 posteromedial and 1 lateral robust setae; both rami almost same lengths, outer rami with 11, 12, 13 articles and inner rami with 10, 11, 5 + articles in pleopods 1 – 3, respectively. Uropod 1, peduncle long, dorsal surface with 8 (1 lost) lateral, 1 laterodistal, 5 (1 lost) medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus short, tip lost, with 3 lateral robust setae; inner ramus ca. 1.15 times as long as peduncle, with 5 lateral, 4 (1 lost) medial and 4 terminal robust setae. Uropod 2 shorter than uropod 1; peduncle short, with 2 lateral and 1 laterodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.75 times length of peduncle, with 3 (1 lost) lateral and 4 (1 lost) terminal robust setae; inner ramus longer than outer ramus (tip lost), with 5 lateral and 5 medial robust setae. Uropod 3 relatively long, about 0.75 times length of uropod 1; peduncle very short, longer than wide, ventrodistal end slightly produced, medial margin with several short setae; outer ramus short (tip lost), with 2 lateral and 3 medial robust setae; inner ramus very long, ca. 2.65 times length of peduncle, with 6 lateral and 9 medial robust setae. Telson small, trapezoidal, distal margin truncated, both laterodistal corners with a small notch, dorsal surface bearing 6 sensory setae and 6 short setae. Description of female. Based on paratype, female, 4.6 mm (OMNH-Ar- 13231). Almost similar to holotype, male, 5.0 mm (OMNH-Ar- 13230) except for oostegites. Gnathopods almost similar to those of male; but gnathopod 1 coxa lacking anteroventral notch, basis with 2 long setae on posteroproximal margin, and carpus anterior margin with several robust setae (Fig. 25 F-G 1), and gnathopod 2 basis bearing single long seta posteroproximally (Fig. 25 F-G 2). Coloration in life. Based on holotype, male, 5.0 mm (OMNH-Ar- 13230, Fig. 26). Eyes light red, other parts faintly-orangish white, but lateral surface of pereonite 7 with dark red mark mid-posteriorly and posterolateral margin of pleonite 3 dark red.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	discussion	Remarks. Lobatoradarea inermis sp. nov. shares the bare dorsal margins of the pereonite 7 and pleonites 1, 2 with L. subinermis sp. nov. However, this new species can be distinguished from L. subinermis by the slightly produced anteroventral corner of the head and the larger eyes. Habitat. Deep bottom with a depth of 84 – 109 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFA8FF85FF78325F17CAFD33.taxon	distribution	Distribution. Japan: Sagami Bay and Kagoshima Bay (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	description	(Figs 27 – 30)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	materials_examined	Type material. Holotype: male, 2.9 mm (OMNH-Ar- 13233), Ōsumi Strait, off Cape Sata, Minami-ōsumi Town, Kagoshima Prefecture, 30 ° 52 ' 54 " N, 130 ° 40 ' 48 " (Fig. 1 K), 121 – 123 m depth, rock and gravel bottom, using dredge, T / V Nansei-maru (Kagoshima University), 1 October 2024, coll. Masafumi Kodama. Type locality. Ōsumi Strait in Kagoshima Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	etymology	Etymology. From the Latin obliquus, - a, - um (= oblique), referring to the strongly oblique palms of the gnathopods. Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	description	Description of male. Based on holotype, male, 2.9 mm (OMNH-Ar- 13233). Head (Fig. 27). Rostrum strongly developed, lateral cephalic lobe roundish-angular, anteroventral corner acutely projected. Eyes large (diameter: 43 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.6: 0.3; accessory flagellum very short, bullet-shaped, with 5 setae; primary flagellum with 18 + articles, tip lost, article 1 long, 3 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 3.0: 4.7, each article bearing several robust setae; flagellum with 28 + articles, tip lost, article 1 very long. Upper lip relatively short, ventral margin rounded, anterior surface and ventral margin with many minute setae. Mandibles, both incisors with 7 cusps, laciniae mobilis 5 - and 3 - toothed in left and right, respectively, accessory setal rows with 5 and 4 thick setae, respectively; palp stout, article length ratio 1.0: 3.9: 2.8 in left, article 1 short, bare, article 2 long, with 1 – 2 setae subdistally, article 3 bearing 1 proximal, 1 median and 8 ventral setae and 1 thick and 2 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with relatively short mandibular lobes, mediodistal surfaces with fine setae. Maxilla 1 (left), inner plate narrowed distally, medial margin bearing 12 long plumose setae, tip with 1 long and 2 short setae; outer plate distally with 11 denticulate robust setae and 4 thick setae; palp article 1 bare, article 2 apically with 6 triangular and 1 long robust and 4 slender setae. Maxilla 2, inner plate ca. 1.3 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 6 short robust setae mediodistally; palp article 3 dorsal surface with 4 thick setae and many fine setae. Pereon (Figs 28, 29). Pereonite 7 not projected posterodorsally. Gnathopod 1 small; coxa roundish rectangular, with 1 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing several setae; basis slender, slightly curved anteriorly, anterior margin with 4 robust setae, medial surface bearing a long seta posteroproximally; merus projected distally, with several thick setae on posterodistal margin; carpus longish triangular, posterior margin bearing many thick setae; propodus longer than carpus (ca. 1.15 times), posterior margin with many thick setae, palm strongly oblique, defined by 2 (1 lateral and 1 medial) long robust setae; dactylus short. Gnathopod 2 longer than gnathopod 1; coxa roundish rectangular, with 1 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface lacking setae; basis slender, straight, anterior and posterior margins with a few short setae; merus projected distally, posterodistal corner with 2 setae; carpus long and narrow, posterior margin bearing several bundles of thick setae; propodus longer than carpus (ca. 1.1 times), narrow, anterior margin with a few short setae, posterior margin bearing many bundles of thick setae, palm strongly oblique, defined by 2 (1 lateral and 1 medial) long robust setae; dactylus short. Pereopod 3 longer than gnathopod 2; coxa roundish rectangular, with 3 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing several setae; basis straight, anterior margin with 3 robust setae, posterior margin with a few short setae, posterodistal corner bearing a robust seta; merus anterodistal corner with a robust seta, posterodistal corner bearing a long seta; carpus posterior margin and posterodistal corner with 3 and 2 robust setae, respectively; propodus longer than carpus, posterior margin and posterodistal corner with 4 and 2 robust setae, respectively; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin rounded, with 2 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing several setae; basis straight, anterior and posterior margins with several slender setae, posterodistal corner bearing a robust seta; ischium – dactylus similar to those of pereopod 3. Pereopod 5, coxa anteroventral and posterior margins with 1 and 3 small notches, respectively; basis ovoid, with anterolateral ridge, anterior margin with a few slender setae and 3 robust setae, anterodistal corner bearing 2 robust setae, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with a long seta at anterodistal corner; merus anterior margin with 2 + 3 robust setae, anterodistal corner bearing 3 robust setae, posterior margin with 2 (1 lost) robust setae, posterodistal corner bearing 4 robust setae; carpus – dactylus lost. Pereopod 6, coxa anterior margin straight, without setae, posteroventral margin with 3 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 3 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta (damaged); ischium with a long seta at anterodistal corner; merus – dactylus lost. Pereopod 7, coxa short, oval, posteroventral margin with a small notch, gill unknown; basis large, ovoid, posteroproximal corner roundly projected, lateral surface with anteroproximal ridge, anterior margin with a proximal seta and 5 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta; ischium with a long seta at anterodistal corner; merus with 3 anterior, 2 anterodistal, 4 posterior and 4 posterodistal robust setae; carpus – dactylus lost. Pleon (Fig. 29). Pleonites 1, 2 projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces with ridge in plates 1, 2, ventral margins bearing 2, 2 and 1 robust setae in plates 1 – 3, respectively. Pleopods, pleopod 2 longest, each peduncle with 2 coupling hooks; pleopod 1 peduncle lacking setae, but with a robust seta posteromedially, both rami with 11 articles; pleopod 2 peduncle bearing several slender setae, 1 long anterodistal seta and 2 posteromedial robust setae, outer and inner rami with 12 and 11 articles, respectively; pleopod 3 peduncle with 3 lateral and 6 posteromedial robust setae, both rami damaged. Uropod 1, peduncle long, dorsal surface with 4 lateral, 1 laterodistal, 3 medial and 1 mediodistal robust setae, ventrodistal end with long inter-ramal process; outer ramus short, ca. 0.65 times length of peduncle, with 4 terminal robust setae; inner ramus damaged, with 2 + medial robust setae. Uropod 2 damaged; peduncle with 1 + lateral, 1 laterodistal and 1 mediodistal robust setae, ventrodistal end weakly produced; outer ramus short, with 1 lateral and 3 (1 long and 2 short) terminal robust setae; inner ramus with 1 + lateral and 2 + medial robust setae. Uropod 3, peduncle slightly longer than wide, ventrodistal end acutely produced, dorsal and ventral surfaces with a few setae; outer ramus ca. 1.25 times length of peduncle, distinctly narrowed distally, with 2 lateral and 1 medial robust setae and apical minute seta; inner ramus lost. Telson small, triangular, distal margin pointed, with 5 minute setae, each lateral margins bearing 3 – 4 short setae proximally, dorsal surface with couple of 2 + 1 sensory setae. Female. Unknown. Coloration in life. Based on holotype, male, 2.9 mm (OMNH-Ar- 13233, Fig. 30). Head light brown, eyes whitish pink; pereonites 1 – 4 light brown, pereonites 5 – 7 and pleonites 1, 2 pale brown, lateral surfaces of pereonite 7 and pleonites 1, 2 each with distinct orange mark mid-posteriorly, pleonite 3 and urosomites white; antenna 1 peduncular article 1 white, articles 2, 3 dark red, flagellum pale pink, antenna 2 peduncular articles 1 – 3 white, article 4 dark red, article 5 and flagellum pale pink; upper part of mouth parts pale orange, other appendages white and partly pale orange.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	discussion	Remarks. Lobatoradarea obliquua sp. nov. is characterized by the strongly oblique palms of the gnathopods 1, 2 and the long inter-ramal process of the uropod 1 peduncle. These characters are unique in the genus. Habitat. Rock and gravel bottom with a depth of 121 – 123 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF92FF8AFF7832271003FC37.taxon	distribution	Distribution. Japan: Ōsumi Strait in Kagoshima Prefecture (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	description	(Figs 31 – 35)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	materials_examined	Type material. Holotype: ovigerous female, 8.3 mm (OMNH-Ar- 13234), south of Tanegashima Island, Kagoshima Prefecture, 30 ° 12 ' 27 " N, 130 ° 59 ' 09 " E (Fig. 1 L), 104 – 194 m depth, using beam-trawl, TR / V Toyoshio-maru (Hiroshima University), 22 May 2024, coll. Masafumi Kodama. Paratypes: 2 ovigerous females, 8.8, 7.7 mm (OMNH-Ar- 13235, 13236), female with juveniles, 7.7 mm (OMNH-Ar- 13237), 2 females, 5.6, 5.4 mm (OMNH- Ar- 13238, 13239), 2 males, 5.1, 4.4 mm (OMNH-Ar- 13240, 13241), same data as holotype. Type locality. South of Tanegashima Island, Kagoshima Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	etymology	Etymology. From the Latin angulatus, - a, - um (= angular), referring to the shape of the coxa 4. Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	description	Description of female. Based on holotype, ovigerous female, 8.3 mm (OMNH-Ar- 13234). Head (Figs 31, 32). Rostrum developed, lateral cephalic lobe angular, anteroventral corner moderately projected. Eyes large (diameter: 47 % of head height), bulging laterally. Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.7: 0.2; accessory flagellum very short, rod-shaped, with 4 setae; primary flagellum with 19 + articles, tip lost, article 1 long, 7 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.4: 3.1, each article bearing several robust setae; flagellum very long, with 58 + articles, article 1 long, tip lost. Upper lip relatively long, produced ventrally, ventral margin with many short and minute setae, anteroproximal surface bearing minute setae. Mandibles, both incisors with 8 cusps, laciniae mobilis 7 - and 3 - toothed in left and right, respectively, both accessory setal rows with 6 thick and 6 slender setae; palp stout, article length ratio 1.0: 3.4: 2.7, article 1 short, bare, article 2 long, with 5 – 6 setae subdistally, article 3 bearing 1 proximal, 8 – 9 ventral and 2 thick and 2 slender distal setae, lateral and medial surfaces covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with mandibular lobes setose distally, mediodistal margins with many setae, ventrodistal surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae, tip with a long thick seta; outer plate distally with 11 denticulate robust setae and many slender setae; palp article 1 bare, article 2 apically with 7 triangular and 1 long robust setae and 4 slender setae in left and 9 narrow robust setae and 5 slender setae in right. Maxilla 2, inner plate ca. 1.4 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 5 long and 10 short robust setae mediodistally; palp article 3 dorsal surface with 5 thick setae and many fine setae. Pereon (Figs 31, 33). Pereonite 7 strongly projected posterodorsally. Gnathopod 1 small; coxa roundish rectangular, with a small notch on posteroventral margin, lateral surface with a long seta posteroproximally, medial surface bearing many setae; basis slender, straight, anterior margin lined with robust setae, posterior margin bearing 4 long proximal setae and several short setae, medial surface setose proximally; ischium with a robust seta posterodistally; merus acutely projected distally, with several thick setae on posterodistal margin; carpus relatively short, anterior margin with 3 robust setae, posterior margin bearing many thick setae; propodus longer than carpus (ca. 1.15 times), posterior margin setose, palm weakly oblique, defined by 6 (3 lateral and 3 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish trapezoidal, with 2 small notches on posteroventral margin, medial surface bearing several setae distally; basis slender, straight, anterior margin lined with several robust setae, posterior margin lined with long and short slender setae; ischium with a robust seta anteriorly; merus acutely projected distally, posterior margin with several setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.3 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 7 (4 lateral and 3 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish square, with 1 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many slender setae and 2 short robust setae; basis slightly curved anteriorly, anterior margin with several slender setae proximally and 8 robust setae distally, posterior margin with several slender setae and 7 robust setae; merus anterior margin with 2 robust setae, anterodistal and posterodistal corners bearing 3 and 1 robust setae, respectively; carpus anterior margin with a robust seta in middle, posterior margin and posterodistal corner bearing 4 and 2 robust setae, respectively; propodus longer than carpus, anterior and posterior margins with 3 and 1 + 2 + 2 + 1 + 1 + 2 robust setae, respectively; dactylus smooth. Pereopod 4 almost same length as pereopod 3; coxa ventral margin strongly angular in middle, with 2 small notches on posteroventral margin, medial surface bearing many setae; basis slightly curved anteriorly, anterior margin with several slender setae proximally and 6 robust setae distally, posterior margin with several slender setae proximally and 1 + 1 + 1 + 2 + 2 robust setae distally; ischium – dactylus almost similar to those of pereopod 3. Pereopod 5, coxa anteroventral, posteroventral and posterior margins with 1, 1 and 2 small notches, respectively; basis oval, lateral surface with anterior and median ridges, anterior margin with many proximal setae and 1 + 1 + 1 + 2 + 1 robust setae, anterodistal corner bearing 2 robust setae, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with 2 robust setae at anterodistal corner; merus with 2 + 1 + 2 anterior, 2 anterodistal, 1 + 2 + 1 posterior and 5 posterodistal robust setae; carpus with 1 + 3 + 1 anterior, 4 anterodistal, 1 + 2 + 1 posterior and 3 posterodistal robust setae; propodus with 1 + 2 + 2 + 1 + 1 + 2 anterior, 2 anterodistal and 1 + 2 + 2 + 1 posterior robust setae; dactylus smooth. Pereopod 6, coxa anterior margin slightly excavate, with several setae, posteroventral margin with 2 + 3 small notches; basis ovoid, lateral surface with anterior and median ridges, anterior margin with many proximal setae and 5 robust setae, anterodistal corner bearing 3 robust setae, posterior margin serrated, medial surface with several proximal setae, median robust seta and vertical ridge bearing a robust seta; ischium with 2 robust setae at anterodistal corner; merus with 1 + 2 + 2 + 2 anterior, 3 anterodistal, 1 + 1 + 2 + 1 + 2 posterior and 6 posterodistal robust setae; carpus – dactylus lost. Pereopod 7, coxa short, semicircular, anterior margin setose, posterior margin with 3 small notches; basis wide, roundish rectangular, lateral surface with anterolateral and median ridges, anterior margin with many proximal setae and 7 robust setae, anterodistal corner bearing 2 robust setae, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta; merus with 1 + 3 + 2 + 2 + 2 anterior, 3 anterodistal, 1 + 1 + 1 + 2 + 2 posterior and 8 posterodistal robust setae; carpus with 3 + 3 + 3 + 3 anterior, 7 anterodistal, 1 + 1 + 2 + 1 + 2 + 1 posterior and 5 posterodistal robust setae; propodus with 2 + 2 + 3 + 2 + 3 + 2 + 2 anterior, 3 anterodistal and 1 + 1 + 2 + 2 + 2 + 1 posterior robust setae; dactylus smooth. Pleon (Figs 31, 34). Pleonites 1, 2 acutely projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces with ridge in plates 1, 2, ventral margins bearing 3, 4 and 4 robust setae, respectively. Pleopods, pleopod 2 longest; each peduncle bearing many or several setae and 2 coupling hooks, peduncle of pleopods with 1, 1 and 6 robust setae posteromedially, respectively, peduncle of pleopod 3 also bearing 2 lateral robust setae; outer rami almost same length as inner rami, both rami with 17 – 19 articles. Uropod 1, peduncle long, dorsal surface with 8 lateral, 1 laterodistal, 7 medial and 1 mediodistal robust setae, ventrodistal end roundly produced; outer ramus ca. 0.7 times length of peduncle, with 6 lateral and 4 terminal robust setae; inner ramus ca. 1.6 times as long as outer ramus, with 11 (1 lost) lateral, 8 medial and 4 terminal robust setae. Uropod 2 about 0.85 times as long as uropod 1; peduncle short, with 5 lateral, 1 laterodistal, 2 medial and 1 mediodistal robust setae, ventrodistal end triangularly produced; outer ramus ca. 0.8 times length of peduncle, with 4 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 2.25 times as long as outer ramus, with 11 lateral, 9 medial and 4 terminal robust setae. Uropod 3 about 0.9 times length of uropod 2; peduncle very short, slightly longer than wide, ventrodistal end acutely produced, lateral margin with several minute setae; outer ramus ca. 1.85 times length of peduncle, with 8 lateral and 8 medial robust setae, tip bearing minute seta; inner ramus about 1.45 times as long as outer ramus, with 13 lateral, 16 medial and 1 dorsoproximal robust setae, tip bearing minute seta. Telson small, subtrapezoidal, dorsal surface with pair of 2 + 1 sensory setae, each lateral margin bearing 2 short setae, distal margin rounded, with 4 small notches, mediodistal margin bearing several denticles and many minute setae. Description of male. Based on paratype, male, 5.1 mm (OMNH-Ar- 13240). Almost similar to holotype, ovigerous female, 8.3 mm (OMNH-Ar- 13234) except for size and oostegites. Gnathopods resembling those of female; but gnathopod 1 larger, coxa longer, lacking many inner setae, basis wider, posterior margin without long setae, propodus posterodistal corner bearing 5 (3 lateral and 2 medial) short robust setae (Fig. 34 M-G 1); gnathopod 2 coxa longer, lacking medial setae and bearing a small notch each on anteroventral and posteroventral corners, basis with a long seta posteriorly, propodus ca. 1.15 times as long as carpus, posterodistal corner with 4 (2 lateral and 2 medial) short robust setae (Fig. 34 M-G 2). Coloration in life (Fig. 35). Type A (most of specimens), based on paratype, ovigerous female, 7.7 mm (OMNH- Ar- 13236). Head, pereonites and pleonites dark orange, urosomites light orange, eyes bright orange; antennae peduncles dark orange, flagella faintly-orangish white; coxae and bases of all pereopods dark orange partly with indistinct whitish points, ischia – dactyli of gnathopods 1, 2 light orange, those of pereopods 3 – 7 reddish orange and white, pleopods and uropods pale pink. Type B (part of large females), based on paratype, ovigerous female, 8.8 mm (OMNH-Ar- 13235). Mid-lateral surfaces from posterior head to pleonite 3 with bright white band, other parts almost same as Type A.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	discussion	Remarks. Lobatoradarea angulata sp. nov. has the angular ventral margin of the coxa 4. Although L. thermicola sp. nov. has a similar coxa 4, the other Lobatoradarea species have a coxa 4 with rounded or slightly angular ventral margin. This new species is different from L. thermicola in having larger eyes and in the smooth dactyli of the pereopods 3 – 7. Habitat. On the bottom between the depth of 104 – 194 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF9DFF8CFF78352310A0F86B.taxon	distribution	Distribution. Japan: south of Tanegashima Island, Kagoshima Prefecture (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	description	(Figs 36 – 41)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	materials_examined	Type material. Holotype: ovigerous female, 7.1 mm (OMNH-Ar- 13242), Kumano-nada, off Owase City in Mie Prefecture (Fig. 1 H), 310 – 320 m deep, inhabiting sunken wood, using a commercial trawl net, 27 October 2019 (reared continuously in aquarium until 2 November 2023), coll. Takeya Moritaki. Paratypes: 6 ovigerous females, 7.3, 7.0, 6.8, 6.4, 6.2, 5.6 mm (OMNH-Ar- 13243 – 13248), 1 female, 7.1 mm (OMNH-Ar- 13249), and 2 males, 5.3, 4.4 mm (OMNH-Ar- 13250, 13251), same data as holotype. Type locality. Kumano-nada, off Owase City in Mie Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	etymology	Etymology. From the Latin lignorum (= wood), referring to the habitat of this species. Used as noun in apposition.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	description	Description of female. Based on holotype, ovigerous female, 7.1 mm (OMNH-Ar- 13242), paratype, ovigerous female, 7.0 mm (OMNH-Ar- 13244) for lower lip, and paratype, ovigerous female, 6.2 mm (OMNH-Ar- 13247) for uropods 1, 2. Head (Figs 36, 37). Rostrum developed, lateral cephalic lobe rounded, anteroventral corner slightly projected. Eyes oval, medium-sized (diameter: 37 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.7: 0.2; accessory flagellum short, cylindrical, with 3 setae on tip; primary flagellum long, with 59 articles, article 1 relatively long, aesthetascs absent. Antenna 2 longer than antenna 1, peduncular articles 3 – 5 with length ratio of 1.0: 2.6: 3.8, each article bearing several setae; flagellum long, with 71 articles, article 1 long. Upper lip relatively long, produced ventrally, anterior surface and ventral margin with many minute setae. Mandibles, incisors with 9 and 8 cusps in left and right, respectively, laciniae mobilis 8 - and 3 - toothed in left and right, respectively, accessory setal rows with 5 and 4 thick setae in left and right, respectively; palp stout, article length ratio 1.0: 3.7: 2.2 in left, article 1 short, bare, article 2 long, with 4 – 5 setae subdistally, article 3 bearing 1 proximal, 9 ventral and 1 thick and 2 slender distal setae, lateral and medial surfaces covered with dense thin setae. Lower lip, inner lobes large, bare; outer lobes triangular, with relatively long mandibular lobes, setose mediodistally, ventral surfaces and lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae; outer plate distally with 11 denticulate robust setae and many slender setae; palp article 1 bare, article 2 apically with 7 triangular robust setae and 4 slender setae in left and 7 narrow robust setae and 5 slender setae in right. Maxilla 2, inner plate wide, ca. 1.7 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 9 short robust setae mediodistally; palp article 3 dorsal surface with 4 thick setae and many fine setae. Pereon (Figs 36, 38). Pereonite 7 with strong projection posterodorsally. Gnathopod 1 relatively short; coxa subrectangular, with a small notch each on anteroventral and posteroventral corners, medial surface bearing many setae; basis slender, straight, anterior margin lined with short setae, posterior margin bearing 8 long setae, medial surface setose anteriorly; merus acutely projected distally, with several setae on posterodistal margin; carpus relatively long, posterior margin bearing many thick setae; propodus slightly longer than carpus (ca. 1.1 times), posterior margin with several thick setae and many slender setae, palm weakly oblique, defined by 5 (3 lateral and 2 medial) short robust setae; dactylus short. Gnathopod 2 longer than gnathopod 1; coxa roundish trapezoidal, with a small notch each on anteroventral and posteroventral corners, medial surface bearing 2 setae; basis slender, straight, anterior margin lined with short setae, posterior margin bearing 7 long setae; merus acutely projected distally, posterodistal corner with 2 short setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus longer than carpus (ca. 1.25 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3, coxa roundish rectangular, with 2 and 4 small notch on anteroventral and posteroventral corners, respectively, medial surface bearing several setae; basis almost straight, anterior margin and anterodistal corner with 6 and 3 robust setae, respectively, anteroproximal and posteroproximal margins with several slender setae; merus anterior margin and anterodistal corner each with a robust seta; carpus posterior margin with 4 robust setae; propodus longer than carpus, posterior margin and posterodistal corner with 5 and 2 robust setae, respectively; dactylus smooth. Pereopod 4, coxa ventral margin slightly angular, with 4 and 6 small notches on anteroventral and posteroventral margins, respectively, medial surface bearing many setae; basis almost straight, anterior margin and anterodistal corner with 3 and 2 robust setae, respectively, anteroproximal and posteroproximal margins with several slender setae; ischium – merus similar to those of pereopod 3; carpus – dactylus lost. Pereopod 5, coxa anteroventral margin with 3 small notches, posterior and posteroventral margins with 3 and 2 small notches, respectively, medial surface bearing several setae anteriorly; basis ovoid, with anterolateral ridge, anterior margin with a few proximal setae and 7 robust setae, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta and several setae; merus with 3 anterior, 3 anterodistal, 4 posterior and 4 posterodistal robust setae; carpus – dactylus lost. Pereopod 6 long; coxa anterior margin slightly concave, with 7 setae, posterior and posteroventral margins each with 2 small notches; basis ovoid, with anterolateral ridge, anterior margin with several proximal setae and 5 robust setae, posterior margin minutely serrated, medial surface with vertical ridge bearing a robust seta; merus with 2 + 2 + 2 anterior, 3 anterodistal, 7 posterior and 4 posterodistal robust setae; carpus with 1 + 3 + 3 + 2 anterior, 4 anterodistal, 1 posterior and 5 posterodistal robust setae; propodus with 1 + 2 + 2 + 2 + 2 + 2 anterior, 3 anterodistal and 3 posterior robust setae; dactylus smooth. Pereopod 7 almost same length as pereopod 6 (probably partly regenerated); coxa short, anterior margin with 4 setae, posteroventral margin with 2 small notches; basis ovoid, with anterolateral ridge, anterior margin with many proximal setae and 4 (1 lost) robust setae, anterodistal corner bearing a robust seta, posterior margin minutely serrated, medial surface with a robust seta; merus with 1 + 2 + 3 anterior, 3 anterodistal, 5 posterior and 4 posterodistal robust setae; carpus with 1 + 2 + 2 + 2 anterior, 4 anterodistal, 2 posterior and 3 posterodistal robust setae; propodus with 2 + 2 + 2 + 2 + 2 + 2 + 1 anterior, 3 anterodistal and 2 posterior robust setae; dactylus smooth. Pleon (Figs 36, 39). Pleonites 1, 2 strongly projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces of plates 1, 2 with ridge, ventral margins of plates 2, 3 bearing 2 and 3 robust setae, respectively. Pleopods, pleopod 2 longest; each peduncle bearing many setae and 2 coupling hooks, peduncle of pleopod 1 with a robust seta posteromedially, peduncle of pleopod 3 bearing 5 posteromedial and 2 lateral robust setae; both rami almost same length, outer rami with 13, 14, 15 articles and inner rami with 12, 13, 13 articles in pleopods 1 – 3, respectively. Uropod 1, peduncle long, dorsal surface with 8 lateral, 1 laterodistal, 3 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.65 times length of peduncle, with 4 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 1.7 times as long as outer ramus, with 7 lateral, 6 (2 lost) medial and 4 terminal robust setae. Uropod 2 about 0.8 times as long as uropod 1; peduncle short, with 3 lateral, 1 laterodistal, 2 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; outer ramus ca. 0.8 times length of peduncle, with 3 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 2.15 times as long as outer ramus, with 8 lateral, 8 medial and 4 terminal robust setae. Uropod 3, peduncle very short, longer than wide, bare, ventrodistal end triangularly produced, medial margin with 3 short setae; outer ramus ca. 1.6 times length of peduncle, with 8 lateral and 6 medial robust setae; inner ramus about 1.75 times as long as outer ramus, with 2 proximal, 11 lateral and 13 medial robust setae. Telson small, trapezoidal, distal margin rounded, dorsal surface with 6 sensory setae, lateral margins bearing several minute setae. Description of male. Based on paratype, male, 5.3 mm (OMNH-Ar- 13250). Almost similar to holotype, ovigerous female, 7.1 mm (OMNH-Ar- 13242) except for oostegites. Gnathopods resembling those of female; but gnathopod 1 coxa lacking anteroventral notch and medial surface of basis bearing fewer setae, propodus with 3 (2 lateral and 1 medial) posterodistal robust setae (Fig. 39 M-G 1), and gnathopod 2 coxa with 2 posteroventral notches, propodus bearing 3 (2 lateral and 1 medial) posterodistal robust setae (Fig. 39 M-G 2). Coloration in life. Based on specimens reared in the aquarium (Figs 40, 41). Head, pereonites, pleonites, all coxae and bases of pereonites 5 – 7 pale pinkish orange (pink ovary seen through in females); eyes bright red, urosomites and other appendages translucent.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	discussion	Remarks. Lobatoradarea lignorum sp. nov. is characterized by a combination of the strong projection on the pereonite 7 and the smooth dactyli of the pereopods 3 – 7. This combination is shared with L. angulata sp. nov.; however, this new species can be distinguished from L. angulata by the smaller eyes and the rounded ventral margin of the coxa 4. Although Lobatoradarea longimana also has such dactyli of the pereopods 3 – 7, the projection on the pereonite 7 of L. longimana is indistinct or absent (Shoemaker 1930, fig. 35). Habitat. On the surface of sunken wood on relatively deep bottom (310 – 320 m depth).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF87FF96FF783754154AF95D.taxon	distribution	Distribution. Japan: Kumano-nada (present study). Behavior observed in the aquarium. Lobatoradarea lignorum sp. nov. inhabits the surface of sunken wood in a group including juveniles (Fig. 41). Each individual moves around, but distinct digging, feeding or mating behaviors have not been observed. This species can be maintained alive for a substantial period easily, even when without any food.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	description	(Figs 42 – 46)	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	materials_examined	Type material. Holotype: female, 4.2 mm (OMNH-Ar- 13252), Sagami Bay, off Miura City, Kanagawa Prefecture, 35 ° 06 ' 53 " N, 139 ° 33 ' 51 " E (Fig. 1 B), 297 – 448 m depth, using dredge, 20 January 2015, coll. Hisanori Kohtsuka. Type locality. Sagami Bay, off Miura City in Kanagawa Prefecture, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	etymology	Etymology. From the Latin sub (= close to) + inermis (related species commonly lacking the posterodorsal projections). Adjective.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	description	Description of female. Based on holotype, 4.2 mm (OMNH-Ar- 13252). Head (Figs 42, 43). Rostrum developed, lateral cephalic lobe rounded, anteroventral corner acutely projected. Eyes medium-sized (diameter: 35 % of head height). Antenna 1, peduncular articles 1, 2 with length ratio of 1.0: 0.6; article 3, accessory flagellum and primary flagellum lost. Antenna 2, peduncular articles 3, 4 with length ratio of 1.0: 2.5, article 5 and flagellum lost. Upper lip rounded ventrally, bearing several minute setae. Mandibles, both incisors with 6 cusps, laciniae mobilis 6 - and 3 - toothed in left and right, respectively, accessory setal rows with 5 and 4 thick setae in left and right, respectively; palp stout, article length ratio 1.0: 3.9: 2.2 in left, article 1 short, bare, article 2 long, with 3 + 1 setae subdistally, article 3 bearing 1 proximal, 7 – 9 ventral and 1 thick and 2 slender distal setae, lateral surface with dense thin setae and single slender seta. Lower lip, inner lobes developed, bare; outer lobes with relatively long mandibular lobes, setose mediodistally, lateral margins with sparse fine setae. Maxilla 1, inner plate pear-shaped, medial margin bearing long setae; outer plate distally with 11 denticulate robust setae and 7 thick setae; palp article 1 bare, article 2 apically with 6 triangular and 1 long robust setae and 4 slender setae in left and 1 triangular and 6 narrow robust setae and 4 slender setae in right. Maxilla 2, inner plate slightly wider than outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 7 short robust setae mediodistally; palp article 3 dorsal surface with 6 thick setae and many fine setae. Pereon (Figs 42, 44). Pereonite 7 not projected posterodorsally. Gnathopod 1 short; coxa widened distally, with 2 small notches each on anteroventral and posteroventral margins, medial surface without setae; basis straight, anterior margin with 4 short setae, posterior margin and medial surface bare; merus acutely projected distally, with several thick setae on posterodistal margin; carpus relatively long, posterior margin bearing many thick setae; propodus longer than carpus (ca. 1.2 times), posterior margin with several thick setae, palm weakly oblique, defined by 2 lateral (long and short) and 1 medial (short) robust setae; dactylus short. Gnathopod 2 longer than gnathopod 1; coxa relatively long, with 2 small notches each on anteroventral and posteroventral margins, medial surface lacking setae; basis slender, straight, anterior margin with 2 short setae distally, posterior margin bearing 2 long and 2 short setae, inner margin with a long seta; merus acutely projected distally, posterodistal corner with a single seta; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus slightly longer than carpus (ca. 1.05 times), narrow, anterior margin with a few short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 2 lateral (long and short) and 2 medial (short) robust setae; dactylus short. Pereopod 3, coxa longish trapezoidal, with 3 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface without setae; basis straight, anterior margin with 3 robust setae, posteroproximal margin with a long seta, posterodistal corner bearing a robust seta; ischium posterodistal corner bearing a short seta; merus slightly widened distally, anterodistal corner with a robust seta; carpus posterior margin and posterodistal corner with 3 and 1 robust setae, respectively; propodus longer than carpus, posterior margin and posterodistal corner with 4 and 2 robust setae, respectively; dactylus slender, smooth. Pereopod 4, coxa ventral margin rounded, with 3 and 2 small notches on anteroventral and posteroventral margins, respectively, medial surface bare; basis straight, anterior margin with 1 long proximal seta and 4 robust setae, posterodistal corner bearing a robust seta; ischium posterodistal corner bearing a short seta; merus slightly widened distally, anterodistal corner lacking a robust seta; carpus posterior margin with 3 robust setae; propodus longer than carpus, posterior margin with 4 robust setae; dactylus slender, smooth. Pereopod 5, coxa posteroventral margin with 2 small notches; basis longish ovoid, with anterolateral ridge, anterior margin with single proximal seta and 5 robust setae, anterodistal corner bearing a robust seta, posterior margin sparsely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus with 1 + 2 anterior, 2 anterodistal, 3 posterior and 3 posterodistal robust setae; carpus – dactylus lost. Pereopod 6, coxa anterior margin straight, without setae, posteroventral margin with 3 small notches; basis ovoid, with indistinct anterolateral ridge, anterior margin and anterodistal corner with 3 and 1 robust setae, respectively, posterior margin sparsely serrated, medial surface with vertical ridge bearing a robust seta; ischium with a robust seta at anterodistal corner; merus – dactylus lost. Pereopod 7, coxa short, oval, posteroventral margin with 2 small notches; basis longish ovoid, with anterolateral ridge, anterior margin with 5 robust setae, posterior margin sparsely serrated, medial surface with vertical ridge lacking a robust seta; merus – dactylus lost. Pleon (Figs 42, 45). Pleonites 1, 2 not projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced in plates 1, 2 and angular in plate 3, lateral surfaces of plates 1, 2 with ridge, ventral margin of plate 2 bearing 2 robust setae. Pleopods, pleopod 2 longest; each peduncle bearing 2 coupling hooks, peduncle of pleopod 2 with several anterior and posterior setae and a long distal seta, peduncle of pleopod 3 bearing several posterior setae and 5 posteromedial and 2 lateral robust setae; outer rami longer than inner rami, outer and inner rami with 9, 10, 10 articles and all 9 articles, respectively. Uropod 1, peduncle long, dorsal surface with 6 lateral, 1 laterodistal, 3 medial and 1 mediodistal robust setae, ventrodistal end slightly produced; both rami damaged, inner ramus with several lateral and medial robust setae. Uropod 2, peduncle short, with 1 laterodistal and 3 (1 lost) robust setae, ventrodistal end roundly produced; both rami damaged. Uropod 3, peduncle very short, longer than wide, ventrodistal end acutely produced, dorsal surface with several short setae; outer ramus with several lateral and medial robust setae, inner ramus lost. Telson narrowed distally, distal end damaged, dorsal surface with 6 sensory setae, lateral margins with a few minute setae. Male. Unknown. Coloration in life. Based on holotype, female, 4.2 mm (OMNH-Ar- 13252, Fig. 46). Head and pereonites 1 – 5 faintly orange; pereonite 6, 7, pleonites 2, 3 and urosomites 2, 3 white; pleonite 1 and urosomite 1 orange; eyes light red; coxae 1 – 7 faintly orange to white, with several orange patches; antennae pale pink; gnathopods, pereopods, pleopods and uropods white, but bases of pereopods 5, 6 each with a bright white mark.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	discussion	Remarks. Although the antenna 1 is almost lost, the uropod 3 inner ramus is also lost and the telson is damaged distally, this species can be identified as a species of the genus Lobatoradarea because of the presence of inner lobes of the lower lip. Only two Lobatoradarea species lack the posterodorsal projections both on the pereonite 7 and the pleonites 1, 2. Lobatoradarea subinermis sp. nov. is different from L. inermis sp. nov. in the acutely produced anterodistal corner of the head, the smaller eyes, and the coloration. The slender dactyli of the pereopods are distinctive in the genus. Habitat. Deep bottom with a depth of 297 – 448 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF81FF9CFF7837CC16E0F863.taxon	distribution	Distribution. Japan: Sagami Bay (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	description	(Figs 47 – 51) Amphipoda indet. 2: Chen et. al., 2024: 10, fig. 5 b.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	materials_examined	Type material. Holotype: female, 7.3 mm (OMNH-Ar- 13253), Sumisu Caldera hydrothermal vent field, northeast of Sumisu Island, Tokyo, 31 ° 28 ' 12.7 " N, 140 ° 04 ' 17.0 " E (Fig. 1 E), 694 m depth, dacite bottom, by a suction sampler mounted on HOV Shinkai 6500 during dive # 1801 on-board R / V Yokosuka cruise YK 24 - 13 C, 21 August 2024, coll. Chong Chen. Paratypes: female, 7.5 mm (OMNH-Ar- 13254), same data as holotype; female, 7.3 mm (OMNH-Ar- 13255), almost same data as holotype from a different diffuse flow location with lat / long 31 ° 28 ' 12.6 " N, 140 ° 04 ' 17.1 " E (Fig. 1 E), 692 m depth; male, 6.2 mm (OMNH-Ar- 13256), Sumisu Caldera hydrothermal vent, 31 ° 28 ' 12.7 " N, 140 ° 04 ' 16.4 " E (Fig. 1 E), 689 m depth, dacite bottom, using HOV, 22 August 2024, coll. Daisuke Uyeno. Type locality. Sumisu Caldera hydrothermal vent, Tokyo, Japan.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	etymology	Etymology. From the Latin thermae (= warm springs) and - cola (= dweller), referring to the hydrothermal vent habitat. Used as noun in apposition.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	description	Description of female. Based on holotype, female, 7.3 mm (OMNH-Ar- 13253) and paratype, female, 7.5 mm (OMNH-Ar- 13254) only for uropod 1. Head (Figs 47, 48). Rostrum developed, lateral cephalic lobe rounded, anteroventral corner slightly projected. Eyes medium-sized (diameter: 33 % of head height). Antenna 1, peduncular articles 1 – 3 with length ratio of 1.0: 0.6: 0.3; accessory flagellum very short, conical, with 5 setae; primary flagellum with 30 + articles, tip lost, article 1 long, 11 articles with aesthetasc. Antenna 2, peduncular articles 3 – 5 with length ratio of 1.0: 2.7: 3.9, each article bearing several robust setae; flagellum long, with 38 + articles, article 1 long, tip lost. Upper lip relatively long, produced ventrally, ventral margin bearing many setae, anterior surface covered with minute setae. Mandibles, both incisors with 9 cusps, laciniae mobilis 6 - and 3 - toothed in left and right, respectively, accessory setal rows with 5 thick and 5 slender setae in left and 4 thick and 4 slender setae in right; palp stout, article length ratio 1.0: 3.0: 1.7, article 1 short, bare, article 2 long, with 0 – 1 proximal and 5 subdistal setae, article 3 relatively short, bearing 1 proximal, 8 ventral and 1 thick and 3 slender distal setae, lateral surface covered with dense thin setae. Lower lip, inner lobes developed, bare; outer lobes with mandibular lobes not-setose distally, mediodistal margins and ventrodistal surfaces setose. Maxilla 1, inner plate pear-shaped, medial margin bearing long plumose setae, tip with a long thick seta; outer plate distally with 11 denticulate robust setae and 8 slender setae; palp article 1 bare, article 2 apically with 5 triangular and 1 long robust setae and 3 slender setae in left and 6 narrow robust setae and 3 slender setae in right. Maxilla 2, inner plate ca. 1.5 times width of outer plate. Maxilliped, inner plate with 3 triangular robust setae distally; outer plate bearing 4 long and 8 short robust setae mediodistally; palp article 3 dorsal surface with 5 thick setae and many fine setae. Pereon (Figs 47, 49). Pereonite 7 strongly projected posterodorsally. Coxae 1 – 7, lateral surfaces covered with minute scale-like furrows. Gnathopod 1 small; coxa roundish rectangular, with a small notch each on anteroventral and posteroventral margins, medial surface bearing a few setae; basis slender, slightly curved anteriorly, anterior margin with several short setae, posterior margin bearing 8 long setae, medial surface with 3 long setae; ischium with a short seta posterodistally; merus acutely projected distally, with several thick setae on posterodistal margin; carpus longish triangular, anterodistal corner with a seta, posterior margin bearing many thick setae; propodus almost same length as carpus, posterior margin setose, palm weakly oblique, defined by 3 (1 lateral and 2 medial) short robust setae; dactylus short. Gnathopod 2 much longer than gnathopod 1; coxa roundish trapezoidal, with a small notch each on anteroventral and posteroventral margins, medial surface bearing a single seta posteriorly; basis slender, straight, anterior margin lined with several short setae, posterior margin and lateral surface with 6 and 3 setae, respectively; merus acutely projected distally, posterior margin with a few setae; carpus long and narrow, posterior margin bearing several bundles of slender setae; propodus a little longer than carpus (ca. 1.1 times), narrow, anterior margin lined with short setae, posterior margin bearing many bundles of slender setae, palm weakly oblique, defined by 4 (2 lateral and 2 medial) short robust setae; dactylus short. Pereopod 3 shorter than gnathopod 2; coxa roundish trapezoidal, with 6 and 3 small notches on anteroventral and posteroventral margins, respectively, medial surface lacking setae; basis slightly curved anteriorly, anterior margin with a few slender setae proximally and a few short setae distally, posterior margin with several slender setae and a posterodistal robust seta; merus anterior and posterior margins with 1 and 4 robust setae, respectively, anterodistal and posterodistal corners each bearing 2 robust setae; carpus anterior margin with several bundles of setae, posterior margin bearing 2 + 2 + 1 + 2 robust setae; propodus longer than carpus, anterior margin with several short setae, posterior margin with 1 + 1 + 1 + 1 + 2 + 2 robust seta; dactylus with a minute projection on inner margin. Pereopod 4 almost same length as pereopod 3; coxa ventral margin weakly angular, with 7 and 5 small notches on anteroventral and posteroventral margins, respectively, medial surface bare; basis slightly curved anteriorly, anterior margin with 2 proximal slender setae and a few distal short setae, posterior margin with a proximal slender seta and posterodistal robust seta; ischium – dactylus almost similar to those of pereopod 3. Pereopod 5, coxa anteroventral, posteroventral and posterior margins each with 2 small notches; basis oval, lateral surface with anterior ridge, anterior margin with a few proximal setae and 7 robust setae, anterodistal corner bearing a long robust seta, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with 2 robust setae at anterodistal corner; merus with 2 + 3 anterior, 2 anterodistal, 1 + 1 posterior and 2 posterodistal robust setae; carpus – dactylus lost. Pereopod 6, coxa anterior margin straight, posteroventral margin with 2 + 1 small notches, medial surface with several setae anteroventrally; basis ovoid, lateral surface with anterior ridge, anterior margin with a few proximal setae and 8 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with vertical ridge bearing a robust seta; ischium with 2 robust setae anteriorly; merus with 2 + 2 + 2 anterior, 2 anterodistal, 3 posterior and 4 posterodistal robust setae; carpus – dactylus lost. Pereopod 7, coxa short, semicircular, anterior margin bare, posteroventral margin with 3 small notches; basis wide, posterodistal corner expanded, lateral surface without ridge, anterior margin with 3 proximal setae and 1 + 1 + 1 + 1 + 2 robust setae, anterodistal corner bearing a robust seta, posterior margin serrated, medial surface with short vertical ridge bearing a robust seta; ischium with an anterodistal robust seta; merus with 1 + 3 + 3 anterior, 4 anterodistal, 1 + 1 + 1 + 1 + 2 posterior and 4 posterodistal robust setae; carpus – dactylus lost. Pleon (Figs 47, 50). Pleonites 1, 2 acutely projected posterodorsally. Epimeral plates 1 – 3, posteroventral corners minutely produced, lateral surfaces with ridge in plates 1, 2, ventral margins of plates 2, 3 each bearing 2 robust setae. Pleopods, pleopod 2 longest; each peduncle bearing several setae and 2 coupling hooks, peduncle of pleopod 3 with 1 lateral and 5 posteromedial robust setae; outer rami slightly longer than inner rami, outer rami bearing 14, 14 and 15 articles, respectively, inner rami each with 13 articles. Uropod 1, peduncle long, dorsal surface with 7 lateral and 5 medial robust setae, ventrodistal end slightly produced; outer ramus ca. 0.6 times length of peduncle, with 5 lateral and 4 (1 lost) terminal robust setae; inner ramus ca. 1.7 times as long as outer ramus, with 12 (3 lost) lateral, 6 medial and 4 (1 lost) terminal robust setae. Uropod 2 shorter than uropod 1; peduncle short, with 3 lateral and 1 laterodistal robust setae, ventrodistal end triangularly produced; outer ramus ca. 0.75 times length of peduncle, with 2 lateral and 4 (1 lost) terminal robust setae; inner ramus damaged distally, with 3 + medial robust setae. Uropod 3, peduncle very short, longer than wide, ventrodistal end acutely produced, dorsal surface and lateral margin with several minute setae; outer ramus ca. 1.3 times length of peduncle, with 4 lateral and 3 medial robust setae, tip bearing minute seta; inner ramus lost. Telson small, roundish triangular, dorsal surface with pair of 2 + 1 sensory setae, each lateral margin bearing many short setae, distal margin rounded, mediodistal margin bearing many minute setae. Description of male. Based on paratype, male, 6.2 mm (OMNH-Ar- 13256). Almost similar to holotype, ovigerous female, 7.3 mm (OMNH-Ar- 13253) except for size and oostegites. Gnathopods resembling those of female; but in gnathopod 1 (Fig. 50 M-G 1), coxa with a small notch on posteroventral margin, posterodistal corner of propodus bearing 4 (2 lateral and 2 medial) robust setae; gnathopod 2 coxa narrower, with 1 and 2 small notches on anteroventral and posteroventral margins, respectively (Fig. 50 M-G 2). Coloration in life (Fig. 51). Based on holotype, female, 7.3 mm (OMNH-Ar- 13253). Eyes silvery orange, other parts white.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	discussion	Remarks. Lobatoradarea thermicola sp. nov. is characterized by a combination of the posterodorsal projection on the pereonite 7 and the angular ventral margin of the coxa 4. This combination is similar to that of L. angulata sp. nov., but this new species can be distinguished from L. angulata by the smaller eyes and the dactyli of the pereopods 3 – 7 with a minute projection. In addition, the minute furrows on the coxae are unique in the genus. Habitat. Hydrothermal vent, dacite bottom between the depth of 689 – 694 m. For further details of the Sumisu Caldera vent field see Chen et al. (2024). This is the second record of Lobatoradarea gen. nov. from hydrothermal vents, as Shaw (1989) already recorded L. longimana from hot vents on the Endeavour Segment of Juan de Fuca Ridge in the northeastern Pacific (depth: 1797 – 2200 m).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	distribution	Distribution. Japan: Sumisu Caldera hydrothermal vent field, Tokyo (present study).	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFF8AFFE4FF7831AE1673FACB.taxon	diagnosis	Emended diagnosis of the genus Oradarea Following the new insights gained from the description of Lobatoradarea gen. nov., we here also emend the diagnosis for genus Oradarea as follows:	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFF3FFE5FF7834BE1515FC7F.taxon	type_taxon	Type species. Oradarea walkeri Shoemaker, 1930, monotypy. Emended diagnosis. Body slender, weakly compressed laterally, integument usually with scales; posterodorsal margin of pereonite 7 often projected, posterodorsal margins of pleonites 1, 2 usually projected. Head with anteroventral corner acutely or slightly produced, rostrum distinct. Antennae long, slender, flagella lacking calceoli; antenna 1 peduncular articles usually progressively shorter, accessory flagellum 1 - articulate; antenna 2 longer than antenna 1. Mandible, molar triturative, columnar; palp article 2 longer than article 3. Lower lip lacking inner lobes. Maxilla 1, inner plate with many medial setae, outer plate with many robust setae distally; palp article 1 shorter than article 2, article 2 bearing distal robust setae. Maxilla 2, inner plate ca. 0.9 – 1.5 times width of outer plate; inner plate with facial row of many setae and medial setae, outer plate bearing distal setae. Coxae medium length; coxa 1 with anterodistal corner rounded, coxa 4 excavated posteroproximally, coxae 5, 6 bilobed. Gnathopod 1 short, subchelate; propodus longer than or as long as carpus, palm oblique. Gnathopod 2 much longer than gnathopod 1, subchelate, sexual dimorphism indistinct; carpus and propodus elongate, with many short posterior setae, propodus longer than carpus, palm oblique, dactylus short. Pereopods 3 – 7 slender, dactyli smooth or with a minute projection on inner margins, bases of pereopods 5 – 7 lobate. Epimeral plates 1 – 3, posteroventral corners more or less produced. Uropods 1 – 3 progressively shorter, outer rami shorter than inner rami, both rami usually with dorsolateral and dorsomedial robust setae. Telson longer than wide, generally entire, but rarely incised slightly; distal margin rounded, subacute or truncated. Included species (15 species). Oradarea acuminata Thurston, 1972; O. bidentata K. H. Barnard, 1932; O. crenelata Alonso de Pina, 1995; O. dawa Lowry & Myers, 2003; O. edentata K. H. Barnard, 1932; O. impressicauda K. H. Barnard, 1932; O. novaezealandiae (Thomson, 1879); O. ocellata Thurston, 1972; O. rossi Thurston, 1972; O. shoemakeri Pirlot, 1934; O. surera Alonso, 2012; O. tricarinata K. H. Barnard, 1932; O. tridentata K. H. Barnard, 1932; O. unidentata Thurston, 1972; and O. walkeri Shoemaker, 1930.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFF3FFE5FF7834BE1515FC7F.taxon	discussion	Remarks. J. L. Barnard & Karaman (1991) and the World Register of Marine Species (WoRMS) database (Horton et al. 2025) both include O. megalops (Nicholls, 1938) in the genus; however, this species does not belong to Oradarea but instead to Atylopsis Stebbing, 1888 because of the shorter gnathopod 2 and the emarginate telson (Thurston 1972, Rauschert 1989). In O. shoemakeri, morphological characters of the male specimen from another locality (Sulawesi) quite differ from those of the female type (Pirlot 1934), and the male specimen should be transferred to another genus probably in the family Amathillopsidae Pirlot, 1934. In addition, in three Oradarea species including O. bidentata, O. impressicauda, and O. tricarinata, the lower lip has not been described (K. H. Barnard 1932); re-examination of these species is required.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
547E827AFFF3FFE5FF7834BE1515FC7F.taxon	distribution	Distribution. Only in the Southern Hemisphere: mainly Antarctica (Thurston 1972); Argentina (Alonso 2012), New Zealand (Thomson 1879), New Caledonia (Lowry & Myers 2003), and Timor (Pirlot 1934). Depth range: 0 – 525 m.	en	Ariyama, Hiroyuki, Kohtsuka, Hisanori, Hoshino, Osamu, Kodama, Masafumi, Moritaki, Takeya, Chen, Chong (2025): Lobatoradarea, a new genus of the family Calliopiidae Sars, 1895 (Crustacea: Amphipoda) from Japan, with descriptions of ten new species. Zootaxa 5699 (1): 1-72, DOI: 10.11646/zootaxa.5699.1.1, URL: https://doi.org/10.11646/zootaxa.5699.1.1
