taxonID	type	description	language	source
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	description	(Figs. 1 – 3)	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	diagnosis	Diagnosis. Females: Carapace with three weak oblique ridges on each side, vertical ridge connecting 1 st and 2 nd oblique ridge obsolete; 1 st oblique ridge branch and re-unite on dorsal surface, making encircled region; pseudorostrum 0.11 – 0.13 times carapace length, not upturned; eye lobe semicircular; frontal lobe with no transverse ridge. Maxilliped 3 basis inner distal corner projected; inner and outer margins of merus and carpus serrated; inner margin of propodus serrated. Pereopod 1 basis inner distal corner projected. Uropod peduncle 2.1 – 2.5 times pleonite 6, 2.1 – 2.3 times exopod and 1.9 – 2.2 times endopod; exopod 0.9 times endopod. Males. Pereonite 5 with pair of large penial lobes; pleon with lateral groove; antenna 2 exceeding posterior end of pleon; uropod peduncle 2.4 – 2.7 times pleonite 6, 2.3 – 2.4 times exopod and 1.9 – 2.0 times endopod.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	materials_examined	Material examined. Holotype ovigerous female, 3.3 mm (NSMT Cr- 32968), off Esashi, northern coast of Hokkaido, the Sea of Japan, 41 ° 47.46 ΄ N, 139 ° 34.49 ΄ E – 41 ° 48.96 ΄ N, 139 ° 34.88 ΄ E, 563 – 605 m (KT- 11 - 9, St. E 3), 29 May 2011. Paratypes. 52 females, 22 males, 11 juveniles (including dissected 5 ovigerous females, 3.0 – 3.4 mm, 3 adult males, 3.8 – 3.9 mm (NSMT Cr- 22792), same locality and date as holotype female (KT- 11 - 9, St. E 3).	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	description	Description. Holotype ovigerous female, 3.3 mm (Figs. 1 A, B). Carapace 0.44 times total body length, 1.37 times width and 1.75 times depth, with short setae; integument with scale-like sculpture, making numerous minute spines directing outward on carapace; each side with 3 weak oblique ridges running parallel, 1 st oblique ridge branch and re-unite on dorsal surface, making encircled region; short vertical ridge connecting 1 st and 2 nd oblique ridges absent; third oblique ridge and posterior end of carapace a little apart; pseudorostrum 0.13 times carapace width, not upturned; width of semicircular eye lobe 0.12 times carapace width, 1.19 times eye lobe length; frontal lobe without transverse ridge (Fig. 1 B); antennal notch obsolete; lower margin with very small teeth. Pereon (Fig. 1 A) 0.40 times carapace length. Pleon (Fig. 1 A) 0.38 times total body length, with weak lateral ridge on each side. Paratype ovigerous females, 3.0 – 3.4 mm. Carapace 0.43 – 0.45 times total body length, 1.34 – 1.41 times width and 1.41 – 1.83 times depth; integument covered with scale-like sculpture, forming minute spine anteriorly (Fig. 1 C); very weak vertical ridge connecting 1 st and 2 nd oblique ridges present or absent; frontal lobe without transverse ridge; width of semicircular eye lobe 0.09 – 0.12 times carapace width, 1.0 – 1.2 times eye lobe length; pseudorostrum 0.11 – 0.13 times carapace width, not upturned; antennal notch obsolete; lower margin with minute teeth or spines (anterior end of scale-like sculpture). Pereon 0.37 – 0.44 times carapace length. Pleon 0.37 – 0.38 times total body length. pleonite 6 (Fig. 2 G) length 0.66 – 0.79 times as long as wide. Antenna 1 (Fig. 1 D), peduncle basal article curved, 1.0 – 1.4 times articles 2 and 1.1 – 1.4 times article 3, with simple seta on distal corner; article 2 with 1 short simple seta on distal region; article 3 0.9 – 1.0 times article 2. Main flagellum 3 - articulate, 0.8 – 0.9 times peduncle article 3; basal article 0.9 – 1.1 times combined length of articles 2 and 3; accessory flagellum uni-articulate, 0.4 – 0.5 times article 1 of main flagellum. Antenna 2 (Fig. 1 E) uni-articulate without setae, with 4 – 7 tubercles on distal region. Left and right mandibles (Fig. 1 F) with 3 and 4 robust setae with many minute tubercles, respectively; molar process styliform, 4 - or 5 - dentate; lacinia mobilis 4 - dentate; incisor process 5 - or 6 - dentate. Maxilla 1 (Fig. 1 G) outer endite with 9 – 10 robust setae, some of which dentate; lower 2 setae a little apart from the remaining setae; narrow endite with 5 ciliated setae; palp with 1 terminal seta. Distal end of maxilla 2 (Fig. 1 H) narrow, with 3 terminal and 1 subterminal setae. Maxilliped 1 (Fig. 1 I) with 11 – 12 branchial lobules; merocarpus with 3 – 4 simple setae on distal region and 3 – 5 short simple setae on inner margin; dactylus minute, 0.043 – 0.052 times merocarpus length. Maxilliped 2 (Fig. 1 J) basis 0.6 – 0.7 times combined length of distal articles together, with simple seta on inner distal corner; ischium naked; merus with 0 – 1 plumose setae on inner margin; carpus with 2 – 3 denticules, 1 – 2 simple and 0 – 1 plumose setae on inner margin; propodus rather elongate, with 1 long terminal spine; joint between carpus and propodus strongly bend; dactylus with 3 long terminal spine; coxa with 8 – 10 setae. Maxilliped 3 (Fig. 2 A) basis 0.7 times distal articles together; inner distal corner projected, with 2 – 4 spines, 2 plumose and 0 – 1 simple setae; outer distal corner with 2 plumose setae; ischium short; merus 1.0 – 1.1 times combined length of carpus and propodus, with 8 – 9 teeth and 6 – 7 short simple setae on inner margin and 3 – 5 teeth and 1 plumose seta on outer margin; carpus with 3 – 5 teeth and 3 – 5 simple setae on inner margin, 3 teeth and plumose seta on outer margin; propodus with 4 – 5 teeth and 3 plumose setae on inner margin, plumose seta on outer distal corner; dactylus with 3 – 4 terminal setae; exopod flagellum of 3 articles. Pereopod 1 (Fig. 2 B) basis 0.8 times distal articles together, with 3 plumose setae on inner margin and 1 plumose seta on outer distal corner; merus 0.7 – 0.8 times combined length of carpus and propodus, with 1 – 3 plumose and 4 – 5 simple setae on inner margin, 4 – 6 teeth and 2 plumose setae on outer margin; carpus with 4 – 5 teeth and 3 – 4 simple setae on inner margin, 2 – 5 teeth and 2 plumose setae on outer margin; propodus with 2 – 3 teeth and 2 simple seta on inner margin, 3 plumose setae on outer margin; dactylus with 5 – 6 simple setae; exopod flagellum of 4 articles. Pereopod 2 (Fig. 2 C) basis 0.5 times distal articles together, with 2 plumose seta on inner margin and 1 plumose seta on outer distal corner; carpus with 0 – 2 plumose and 0 – 2 simple setae on lateral margin; dactylus 1.6 – 1.9 times carpus, with 9 – 12 setae; exopod flagellum of 4 articles. Pereopod 3 (Fig. 2 D) basis 1.1 – 1.4 times distal articles together, with two rows of plumose and simple setae on lateral margin. Pereopod 4 (Fig. 2 E) basis 0.9 – 1.0 times distal articles together, with plumose seta on distal corner and plumose seta on side. Pereopod 5 (Fig. 2 F) basis 0.5 – 0.6 times distal articles together. Terminal setae on dactylus of pereopods 3 – 5 fused to the articles. Uropod (Fig. 2 G) peduncle 2.1 – 2.5 times pleonite 6 length, 2.1 – 2.3 times exopod, 1.9 – 2.2 times endopod, serrated on inner and outer margin, exopod 0.9 times endopod, with 2 terminal seta; endopod uni-articulate, with 4 – 5 spiniform setae on inner margin and terminal seta. Paratype 3 adult males, 3.8 – 3.9 mm (Fig. 3). Carapace (Fig. 3 A, B) 0.39 – 0.41 times total body length, 1.39 – 1.44 times width, 1.93 – 2.17 times depth, covered with short setae; each side with 3 oblique ridges running parallel; pseudorostrum (Fig. 3 A, B) 0.092 – 0.099 times carapace length, not upturned; width of eye lobe 0.10 – 0.12 times carapace width, 1.1 – 1.4 times eye lobe length; corneal lenses absent; frontal lobe without transverse ridge; antennal notch shallow. Pereon (Fig. 3 A) 0.52 – 0.60 times carapace length; posterior margin of lateral projection on pereonite 3 – 5 round; pereonite 5 with a pair of penial lobe (Fig. 3 C, D); penial lobe longer than basis of pereopod 5. Pleon (Fig. 3 A) 0.37 – 0.39 times total body length, with lateral grooves; pleonite 6 0.9 times as long as wide. Antenna 1 (Fig. 3 E), peduncle basal article 1.2 – 1.3 times article 2 and 1.5 – 1.6 times article 3; article 3 0.8 times article 2; Main flagellum tri-articulate, 1.0 times peduncle article 3; articles 2 and 3 with 1 aesthetasc, respectively; accessory flagellum uni-articulate, 0.4 – 0.5 times main flagellum article 1. Antenna 2 (Fig. 3 F) peduncle article 5 2.3 – 2.6 times article 4; flagellum of 20 articles, exceeding posterior end of pleon. Maxilliped 3 (Fig. 3 G) basis 0.7 – 0.8 times distal articles together, with 2 plumose setae on inner distal corner and 1 – 3 plumose setae on outer distal corner; merus 0.8 – 0.9 times combined length of carpus and dactylus, with 7 – 8 teeth and 7 – 9 short simple setae on inner margin, 4 – 7 teeth and plumose seta on outer margin; carpus with 3 teeth and 1 plumose, 3 – 4 simple setae on inner margin, 3 teeth and plumose seta on outer margin; propodus with 4 – 5 teeth and 3 plumose setae on inner margin and plumose seta on outer distal corner; dactylus with 4 – 5 terminal setae; exopod flagellum of 6 articles. Pereopod 1 (Fig. 3 H), basis 0.8 – 0.9 times distal articles together, inner distal corner projected, with 1 – 2 plumose setae; outer distal corner with 1 – 2 plumose setae; merus 0.7 times combined length of carpus and propodus, with 1 – 2 plumose and 3 – 4 simple setae on inner margin and 2 – 4 teeth and 2 plumose setae on outer margin; carpus with 3 – 4 teeth and 3 simple setae on inner margin, 2 teeth and 2 plumose setae on outer margin; propodus with 2 – 3 teeth and 1 – 2 simple setae on inner margin, 3 plumose setae on outer margin; exopod flagellum of 6 - articles. Pereopod 2 (Fig. 3 I) basis 0.6 – 0.7 times distal articles together, with plumose seta on inner and outer distal corner; merus with 1 plumose and 0 – 1 simple setae on outer margin and 1 plumose and 0 – 1 simple setae on inner distal corner; carpus with 2 plumose and 1 – 3 simple setae on outer margin; dactylus 1.6 – 1.9 times carpus, with 11 – 13 setae; exopod flagellum of 6 articles. Pereopod 3 (Fig. 3 J) basis 1.6 times distal articles together, with 2 – 3 plumose setae on inner margin and plumose seta on outer margin; exopod flagellum of 6 articles. Pereopod 4 (Fig. 3 K) basis 1.1 – 1.2 times distal articles together, with plumose seta on inner distal corner, exopod flagellum 6 - articulate. Pereopod 5 (Fig. 3 L) basis 0.6 – 0.7 times distal articles together, with plumose seta on distal corner and lateral margin, respectively. Uropod (Fig. 3 M) peduncle 2.4 – 2.7 times pleonite 6, 2.3 – 2.4 times exopod and 1.9 – 2.0 times endopod, with 7 – 9 plumose and 0 – 1 simple setae on inner margin; exopod 0.8 times endopod, with long simple terminal seta and plumose subterminal seta, outer margin with 1 – 2 simple setae; endopod uni-articulate, with 9 – 12 spiniform setae on inner margin and robust terminal seta.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	etymology	Etymology. The species name is dedicated to Dr. Sigeo Gamô, who made great contributions to cumacean taxonomy.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	discussion	Remarks. Male specimens of the present new species are similar to C. rowei Bacescu and Muradian, 1974 from south of Cape Hatteras, North Carolina, western Atlantic, 3045 m. The new species is distinguished from C. rowei by (1) posterior margin of lateral projection on pereonite 3 – 5 round (pointed in C. rowei), (2) separated region of left and right penial lobes subequal in length to the proximal, unseparated region of the lobes (shorter in C. rowei), spermatozoa not observable on tip (observable in C. rowei) (3) eye lobe width 0.10 – 0.12 times carapace width (0.09 in C. rowei), (4) uropod peduncle slightly shorter than combined length of last 3 pleonites (longer than combined length of last 3 pleonites in C. rowei).	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDBFFDDD0DBFCD2AA1C7239.taxon	distribution	Distribution. Japanese coast of the Sea of Japan, 563 – 605 m.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	description	(Figs. 4 – 6)	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	diagnosis	Diagnosis. Females: Carapace compressed antero-posteriorly; each side with three distinct oblique ridges running parallel; 1 st oblique ridge branch and re-unite on dorsal surface, making encircled region; pseudorostrum short, 0.04 – 0.07 times carapace length, upturned; eye lobe semicircular; frontal lobe with distinct transverse ridge. Maxilliped 3 basis inner distal corner projected; inner and outer margins of merus and carpus serrated, inner margin of propodus serrated. Pereopod 1 basis inner distal corner projected. Uropod peduncle 0.8 times pleonite 6, 1.8 – 2.3 times exopod, 1.9 – 2.3 times endopod; exopod 0.9 – 1.0 times endopod. Male. Pereonite 5 with a pair of large penial lobes; pleon with lateral groove; antenna 2 exceeding posterior end of pleon; uropod peduncle 0.8 times pleonite 6, 2.4 times exopod and 1.9 times endopod.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	materials_examined	Material examined. 14 ovigerous and preparatory females, 1 adult and 4 subadult males, 11 juveniles (including dissected 4 ovigerous females, 2.9 – 3.4 mm, 1 preparatory female, 3.2 mm, 1 adult male 3.6 mm) (NSMT Cr- 22780), off Kasumi, northern coast of Hyogo prefecture, Honshu, the Sea of Japan, 35 ° 46.11 ΄ N, 134 ° 30.94 ΄ E – 35 ° 46.57 ΄ N, 134 ° 32.09 ΄ E, 203 – 205 m (KT- 11 - 9, St. K 2), 3 June 2011; 4 females, 2 subadult males, 9 juveniles (including dissected 1 ovigerous female, 3.2 mm) (NSMT- 22779), off Toyama, northern coast of Honshu, 37 ° 28.77 ΄ N, 137 ° 29.07 ΄ E – 37 ° 29.53 ΄ N, 137 ° 28.63 ΄ E, 207 – 258 m (KT- 11 - 9, St. T 2), 31 May 2011; 1 subadult male, off Noto Peninsula, 37 ° 57.06 ΄ N, 136 ° 56.60 ΄ E – 37 ° 57.04 ΄ N, 136 ° 58.23 ΄ E, 201 – 203 m (KT- 11 - 9, St. N 2), 1 June 2011.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	description	Description. 4 ovigerous females, 2.9 – 3.4 mm; 2 preparatory females, 3.2, 3.4 mm. Carapace (Fig. 4 A, B) 0.35 – 0.40 times total body length, 1.18 – 1.29 times as width and 1.33 – 1.46 times depth, covered with short setae; each side with 3 distinct oblique ridges running parallel, 1 st oblique ridge branch and re-unite on dorsal surface, making encircled region; 1 st and 2 nd oblique ridges connected by a short vertical ridge near lower margin of carapace; pseudorostrum 0.03 – 0.07 times carapace length, upturned; width of round eye lobe 0.11 – 0.13 times carapace width, 0.9 – 1.2 times eye lobe length; frontal lobe with distinct transverse ridge (Fig. 7 A, B); antennal notch obsolete; lower margin serrated. Pereon (Fig. 4 A) 0.48 – 0.70 times carapace length. Pleon (Fig. 4 A) 0.38 – 0.42 times total body length; pleon with weak lateral process on each side; pleonite 6 (Fig. 5 G) 0.8 times as long as wide. Antenna 1 (Fig. 4 C), peduncle almost naked; basal article curved, 1.0 – 1.3 times articles 2 and 1.0 – 1.3 times article 3; article 3 0.9 – 1.1 times article 2; main flagellum tri-articulate, 0.8 – 0.9 times peduncle article 3; basal article 1.0 times combined length of articles 2 and 3; accessory flagellum uni-articulate, 0.3 – 0.4 times main flagellum article 1. Antenna 2 (Fig. 4 D) uni-articulate, with 6 tubercles on distal margin. Left and right mandibles (Fig. 4 E) broad at base; with robust 3 and 4 setae with many minute tubercles, respectively; molar process styliform, 3 - or 4 - dentate; lacinia mobilis 4 - dentate; incisor process 5 - or 6 - dentate. Labium (Fig. 4 F) with short simple setae on tip. Maxilla 1 (Fig. 4 G) outer endite with 9 simple or dentate robust setae, lower 2 simple setae a little apart from the remaining setae; narrow endite with 5 ciliated, non-dentate setae; palp with terminal seta. Maxilla 2 (Fig. 4 H) narrow distally, with 3 terminal and 1 subterminal setae. Maxilliped 1 (Fig. 4 I, J) with 4 – 6 branchial lobules (Fig. 4 I); merocarpus with 3 – 4 simple setae on distal region and 3 – 4 short simple seta on inner margin; dactylus minute, 0.04 – 0.07 times merocarpus length (Fig. 4 J). Maxilliped 2 (Fig. 4 K) basis 0.7 – 0.8 times distal articles together; ischium with plumose seta on inner distal corner; carpus with 2 tubercles and 2 simple setae on inner margin; propodus long, with 1 long terminal spines; dactylus with 3 long terminal spines. Maxilliped 3 (Fig. 5 A) basis 0.6 – 0.7 times distal articles together, inner distal corner projected, with 1 – 2 plumose and 0 – 3 simple setae; outer distal corner with 0 – 2 long plumose setae; ischium with 2 – 3 simple setae on inner margin; merus 1.1 – 1.3 times combined length of carpus and propodus, with 7 – 9 teeth and 7 – 9 simple setae on inner margin, and 2 – 4 teeth and plumose seta on outer margin; carpus with 3 – 5 teeth and 2 – 3 simple setae on inner margin, 2 – 3 teeth and a plumose seta on outer margin; propodus with 4 – 6 teeth and 2 – 3 plumose setae on inner margin and plumose seta on outer distal corner; dactylus with 3 terminal setae. Pereopod 1 (Fig. 5 B) basis 0.7 – 0.8 times distal articles together, inner distal corner projected, with 2 plumose setae, outer distal corner with 0 – 1 plumose setae; ischium with 1 – 2 plumose setae on inner margin; merus 0.7 – 0.8 times combined length of carpus and propodus, with 1 – 2 plumose and 2 – 4 simple setae on inner margin, with 2 – 3 plumose seta on outer margin; carpus with 4 – 5 teeth and 2 simple setae on inner margin, 3 teeth and 2 plumose setae on outer margin; propodus with 2 – 3 teeth and 2 simple setae on inner margin, 3 plumose setae on outer margin; exopod flagellum of 4 articles. Pereopod 2 (Fig. 5 C) basis 0.5 times distal articles together, with plumose seta on inner distal corner; dactylus 1.4 – 2.0 times carpus, with 9 – 10 setae. Pereopod 3 (Fig. 5 D) basis 1.2 – 1.4 times distal articles together, with 2 – 3 plumose on lateral margin. Pereopod 4 (Fig. 5 E) basis 0.9 – 1.0 times distal articles together. Pereopod 5 (Fig. 8 F) basis 0.5 – 0.6 times distal articles together. Terminal setae on dactylus of pereopods 3 – 5 fused to the articles. Uropod (Fig. 5 G) peduncle 1.7 – 2.0 times pleonite 6 length, 1.8 – 2.4 times exopod, 1.9 – 2.3 times endopod, serrated on inner margin; exopod 0.9 – 1.0 times endopod, with long simple terminal seta; endopod uni-articulate, with 3 spiniform setae on inner margin and long terminal seta. Adult male, 3.6 mm (Fig. 6). Carapace (Fig. 6 A, B) 0.37 times total body length, 1.46 times width, 1.79 times depth, with few short setae; ridges on carapace similar to females; pseudorostrum (Fig. 6 A, B) 0.06 times carapace length; width of eye lobe 0.13 times carapace width, 1.2 times eye lobe length; corneal lenses absent; antennal notch shallow (Fig. 6 C); lower margin of carapace serrated. Pereon (Fig. 9 A, B) 0.66 times carapace length; pereonite 5 with large penial lobes (left lobe shown in Fig. 6 A, D), longer than basis of pereopod 5. Pleon (Fig. 6 A) 0.39 times total body length, with lateral grooves; pleonite 6 (Fig. 6 M) 0.8 times as long as wide. Antenna 1 (Fig. 6 E), peduncle basal article 1.2 times article 2 and 1.3 times article 3; article 3 0.9 times article 2. Main flagellum tri-articulate, 1.0 times peduncle article 3, with 1 aesthetasc on articles 2 and 3; accessory flagellum uni-articulate 0.4 times main flagellum article 1. Antenna 2 (Fig. 6 F) peduncle articles 5 2.0 times article 4; flagellum of 20 articles, exceeding posterior end of pleon. Maxilliped 3 (Fig. 6 G) basis 0.8 times distal articles together, inner distal corner with 2 plumose and 1 simple setae, outer distal corner with 2 plumose setae; merus 0.9 times combined length of carpus and dactylus, with 8 teeth and 8 short simple setae on inner margin and 5 teeth and plumose seta on outer margin; carpus with 3 teeth and 3 simple setae on inner margin, with 3 teeth and plumose seta on outer margin; propodus with 4 teeth and 3 plumose setae on inner margin and plumose seta on outer distal corner; dactylus with 3 terminal setae; exopod flagellum 5 - articulate. Pereopod 1 (Fig. 6 H) basis 0.8 times distal articles together, inner distal corner with 2 long plumose setae, outer distal corner with plumose seta; merus 0.7 times combined length of carpus and propodus, with 2 plumose and 3 simple setae on inner margin, 4 teeth and 2 plumose setae on outer margin; carpus with 2 teeth and 3 simple setae on inner margin, with 1 tooth and 2 plumose setae on outer margin; propodus with 3 teeth and 2 simple setae on inner margin, with 1 tooth and 2 plumose setae on outer margin; exopod flagellum 5 - articulate. Pereopod 2 (Fig. 6 I) basis 0.6 times distal articles together, with plumose seta on inner and outer distal corner, respectively; dactylus 1.9 times carpus, with 11 setae; exopod flagellum 6 - articulate. Pereopod 3 (Fig. 6 J) basis 1.4 times distal articles together; exopod flagellum 6 - articulate. Pereopod 4 (Fig. 6 K) basis 1.1 times distal articles together; exopod flagellum 6 - articulate. Pereopod 5 (Fig. 6 L) basis 0.7 times distal articles together. Uropod (Fig. 6 M) peduncle 2.7 times pleonite 6, 2.4 times exopod and 1.9 times endopod, with 9 plumose or ciliated setae on inner margin and 5 simple setae on ventral surface; exopod 0.8 times endopod, with 2 terminal and 2 sub-terminal setae; endopod uni-articulate, with 9 spiniform setae on inner margin and terminal seta.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	discussion	Remarks. This species, originally described as Campylaspis pisum based on female specimens collected from northern coast of the Sea of Japan, 42 ° 40 ΄ 9 ″ N, 135 ° 16 ΄ 8 ″ E, 865 – 950 m, (Vassilenko and Tzareva, 2004), is transferred to the genus Campylaspenis due to the presence of the large penial lobes in the adult male specimen. Other morphological characters of the Japanese specimens agree with the original description by Vassilenko and Tzareva. Campylaspenis pisum is similar to C. sigeogamoi, another Campylaspenis species from the Sea of Japan. Campylaspenis pisum is distinguished from C. sigeogamoi by (1) a transverse ridge present on frontal lobe of carapace (not present in C. sigeogamoi), (2) pseudorostrum very short, 0.035 – 0.072 times carapace length, upturned (pseudorostrum not so short, 0.11 – 0.13 times carapace length, not upturned in C. sigeogamoi).	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFDFFFD2D0DBFA44ACF274C1.taxon	distribution	Distribution. Russian and Japanese coast of the Sea of Japan, 865 – 950 m in Russia and 201 – 258 m in Japan.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	description	(Figs. 7 – 9)	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	diagnosis	Diagnosis. Females: Carapace with three distinct oblique ridges on each side, connected on dorsal surface; short vertical ridge connecting 1 st and 2 nd oblique ridges; 1 st oblique ridge branch and re-unite on dorsal surface, making encircled region; pseudorostrum 0.08 – 0.14 times carapace length, not upturned; eye lobe semicircular; frontal lobe with no transverse ridge. Pereopod 1 inner distal corner projected. Uropod peduncle 1.8 – 2.1 times pleonite 6, 2.4 – 3.0 times exopod and 2.1 – 2.7 times endopod. Males. Genital pore present under ventral surface of pereonite 5; uropod peduncle 2.4 – 3.0 times pleonite 6, 2.6 – 2.7 times exopod and 2.0 – 2.2 times endopod; exopod 0.8 times endopod.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	materials_examined	Material examined. 17 females, 4 males, 9 juveniles (includind dissected 3 ovigerous females, 3.8 – 4.3 mm, 2 preparatory females, 3.9, 4.1 mm, 3 adult males, 4.7 – 5.2 mm) (NSMT Cr- 32969), off Esashi, Hokkaido, the Sea of Japan, 41 ° 47.46 ΄ N, 139 ° 34.49 ΄ E – 41 ° 48.96 ΄ N, 139 ° 34.88 ΄ E, 563 – 605 m (KT- 11 - 9, St. E 3), 29 May 2011; 14 females, 4 males, 10 juveniles (NSMT Cr- 22790), off Esashi, Hokkaido, the Sea of Japan, 41 ° 50.26 ΄ N, 139 ° 34.03 ΄ E – 41 ° 48.70 ΄ N, 139 ° 34.18 ΄ E, 388 – 538 m (KT- 11 - 9, St. E 2), 29 May 2011; 53 females, 6 adult and 16 subadult males, 11 juveniles (NSMT Cr- 22789), Musashi Bank, 44 ° 40.48 ΄ N, 140 ° 02.38 ΄ E – 44 ° 39.53 ΄ N, 140 ° 002.83 ΄ E, 198 – 206 m (KT- 11 - 9, St. M 2), 28 May 2011; 3 females, 6 juveniles, 3 manca, Toyama Bay, 37 ° 28.77 ΄ N, 137 ° 29.07 ΄ E – 37 ° 29.53 ΄ N, 137 ° 28.63 ΄ E, 207 – 258 m (KT- 11 - 9, St. T 2), 31 May 2011; 13 females, 7 males, 29 juveniles, 12 manca (NSNT Cr- 22791), 37 ° 19.80 ΄ N, 137 ° 33.38 ΄ E – 37 ° 20.02 ΄ N, 137 ° 34.20 ΄ E, 561 – 583 m (KT- 11 - 9, St. T 4), 1 June 2011; 8 females, 4 males, 13 juveniles, Toyama Bay, 37 ° 18.45 ΄ N, 137 ° 31.77 ΄ E – 37 ° 18.66 ΄ N, 137 ° 32.85 ΄ E, 794 – 808 m (KT- 11 - 9, St. T 5), 1 June 2011.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	description	Description. 5 ovigerous females, 3.6 – 4.3 mm (Figs. 7, 8). Carapace (Fig. 7 A, B) 0.43 – 0.45 times total body length, 1.36 – 1.43 times width and 1.69 – 1.83 times depth, with sparse short setae; integument covered with scale-like sculpture (Fig. 7 C); each side with 3 distinct oblique ridges running parallel, connected at dorsal surface, 1 st oblique ridge branch and re-unite on dorsal surface, making encircled round region; 1 st and 2 nd oblique ridges connected by a short vertical ridge near lower margin of carapace; third oblique ridge running near posterior end of carapace; pseudorostrum 0.08 – 0.14 times carapace width, not upturned; width of semicircular eye lobe 0.07 – 0.10 times carapace width, 0.9 – 1.1 times eye lobe length; frontal lobe with faint or no transverse ridge; antennal notch obsolete; lower margin with minute teeth. Pereon (Fig. 7 A) 0.30 – 0.50 times carapace length. Pleon (Fig. 7 A) 0.36 – 0.39 times total body length; pleonite 2 – 5 with weak lateral ridge on each side; pleonite 6 (Fig. 8 G) length 0.8 – 0.9 times as long as wide. Antenna 1 (Fig. 7 D), peduncle basal article curved, 1.2 – 1.4 times articles 2 and 1.3 – 1.5 times article 3, with an simple seta on distal corner; article 2 with 1 short simple seta on distal corner; article 3 0.9 – 1.0 times article 2; main flagellum tri-articulate, 0.9 – 1.1 times peduncle article 3; basal article 1.0 – 1.3 times combined length of articles 2 and 3; accessory flagellum uni-articulate, 0.3 times article 1 of main flagellum. Antenna 2 (Fig. 7 E) uni-articulate, without setae. Left and right mandibles (Fig. 7 F) broad at base; with 3 and 4 robust setae with many minute tubercles respectively; molar process styliform, 4 - dentate; lacinia mobilis 4 - dentate; incisor process 6 dentate. Maxilla 1 (Fig. 7 G) outer endite with 9 dentate or simple robust setae, lower 2 setae a little apart from the other setae; narrow endite with 5 ciliated or simple setae; palp with terminal seta. Maxilla 2 (Fig. 7 H) narrow distally, with 3 terminal and 1 subterminal setae. Maxilliped 1 (Fig. 7 I, J) with 9 branchial lobules; merocarpus with 3 – 5 simple setae on distal region and 3 – 5 short simple setae on inner margin; dactylus minute, 0.040 – 0.056 times merocarpus length. Maxilliped 2 (Fig. 7 K) basis 0.7 – 0.9 times distal articles together; ischium with plumose seta on inner distal corner; carpus with 2 tubercles and 2 simple setae on inner margin; joint between carpus and propodus strongly bend; propodus long, with 1 long terminal spine; dactylus with 3 long terminal spines; coxa with 7 – 8 setae. Maxilliped 3 (Fig. 8 A) basis 0.7 – 0.8 times distal articles together; inner distal corner projected, with 2 plumose setae and 2 – 5 spines; outer distal corner with 1 – 2 plumose setae; ischium short; merus 1.1 – 1.2 times combined length of carpus and propodus, with 8 – 10 teeth and 6 – 7 short simple setae on inner margin and 4 – 10 teeth and 1 plumose seta on outer margin; carpus with 2 – 4 teeth and 3 plumose and 0 – 1 simple setae on inner margin and 3 teeth and plumose seta on outer margin; propodus 1.7 – 2.1 times dactylus, with 5 teeth and 2 plumose setae on inner margin and 1 plumose seta on outer distal corner; dactylus with 3 terminal setae; exopod flagellum of 3 articles. Pereopod 1 (Fig. 8 B) basis 0.8 – 0.9 times distal articles together; inner distal corner projected, with 2 plumose setae; outer distal corner with 0 – 1 simple seta; ischium with plumose seta and 0 – 1 short simple seta on inner margin; merus 0.7 – 0.8 times combined length of carpus and propodus, with 0 – 1 tooth, 2 plumose and 3 simple setae on inner margin, 3 – 6 teeth and 2 plumose setae on outer margin; carpus with 3 – 5 teeth and 2 – 3 simple setae on inner margin, 2 plumose setae on outer margin; propodus with 2 – 3 teeth and 3 simple seta on inner margin, 2 – 3 plumose and 0 – 1 simple setae on outer margin; dactylus with 1 – 2 terminal setae; exopod flagellum of 4 articles. Pereopod 2 (Fig. 8 C) basis 0.5 – 0.6 times distal articles together, with plumose seta on distal corner; dactylus 1.3 – 1.6 times carpus, with 8 – 11 simple setae; exopod flagellum of 4 articles. Pereopod 3 (Fig. 8 D) basis 1.3 – 1.5 times distal articles together, with 3 plumose and 2 simple setae on lateral margin. Pereopod 4 (Fig. 8 E) basis 0.8 – 1.0 times distal articles together, with 1 – 2 plumose and 1 simple setae on lateral margin. Pereopod 5 (Fig. 8 F) basis 0.5 times distal articles together. Uropod (Fig. 8 G) peduncle 1.8 – 2.1 times pleonite 6 length, 2.4 – 3.0 times exopod, 2.1 – 2.7 times endopod, inner and outer margin serrated; exopod 0.9 times endopod, with long and short simple terminal seta; endopod uni-articulate, with 4 spiniform setae on inner margin and terminal seta. 3 adult males, 4.7 – 5.2 mm (Fig. 9). Carapace (Fig. 9 A, B) 0.37 – 0.40 times total body length, 1.41 – 1.47 times width, 2.01 – 2.14 times depth, with few short setae; each side with distinct 3 oblique ridges connected at dorsal surface; 1 short vertical ridge connects 1 st and 2 nd oblique ridges; pseudorostrum (Fig. 9 A – C) 0.076 – 0.079 times carapace length, not upturned; width of eye lobe 0.10 – 0.12 times carapace width, 1.0 – 1.2 times eye lobe length; corneal lenses absent; frontal lobe without transverse ridge; antennal notch shallow (Fig. 9 C); lower margin of carapace not serrated. Pereon (Fig. 9 A, B) 0.54 – 0.67 times carapace length; pereonite 5 with a couple of genial pores (arrowheads) near basal region of pereopod 5 (Fig. 9 D, E); Pleon (Fig. 9 A) 0.38 – 0.39 times total body length, with lateral grooves; pleonite 6 0.8 – 1.0 times as long as wide. Antenna 1 (Fig. 9 F), peduncle basal article curved, 1.4 – 1.6 times article 2 and 1.4 – 1.6 times article 3; article 3 0.9 – 1.0 times article 2; Main flagellum tri-articulate, 1.2 times peduncle article 3; articles 2 and 3 with 1 aesthetasc, respectively; accessory flagellum uni-articulate, 0.3 – 0.4 times main flagellum article 1. Antenna 2 (Fig. 9 G) peduncle articles 4 and 5 with numerous setae; peduncle article 5 2.0 – 2.2 times article 4; flagellum of 20 articles, exceeding posterior end of pleon. Maxilliped 3 (Fig. 9 H) basis 1.0 times distal articles together, with 0 – 1 plumose setae on inner margin, 2 plumose setae on outer distal corner; merus 1.0 – 1.1 times combined length of carpus and propodus, with 7 – 10 teeth and 6 – 7 simple setae on inner margin, 7 – 8 teeth and plumose seta on outer margin; carpus with 3 – 4 teeth and 3 simple setae on inner margin, 2 – 3 teeth and plumose seta on outer margin; propodus with 4 – 5 teeth and 3 plumose setae on inner margin, plumose seta on outer distal corner; dactylus with 3 – 4 terminal setae; exopod flagellum 6 - articulate. Pereopod 1 (Fig. 9 I), basis 0.9 – 1.0 times distal articles together; inner distal corner of basis projected, with 2 plumose setae; merus 0.7 times combined length of carpus and propodus, with 2 – 3 plumose and 3 simple setae on inner margin, 7 – 8 teeth and 2 pluumose setae on outer margin; carpus with 4 teeth and 2 – 3 simple setae on inner margin, 3 – 5 teeth and 2 plumose setae on outer margin; propodus with 3 teeth on inner margin, 2 teeth and 2 – 3 plumose setae on outer margin; exopod flagellum 6 - articulate. Pereopod 2 (Fig. 9 J) basis 0.7 times distal articles together, with plumose seta on inner and outer distal corner, respectively; dactylus 1.2 – 1.4 times carpus, with 11 – 12 setae; exopod flagellum 7 - articulate. Pereopod 3 (Fig. 9 K) basis 1.7 – 2.0 times distal articles together, with 2 plumose setae on outer margin; exopod flagellum 6 - articulate. Pereopod 4 (Fig. 9 L) basis 1.1 – 1.2 times distal articles together, with 2 plumose setae on inner distal corner, exopod flagellum of 5 articles. Pereopod 5 (Fig. 9 M) basis 0.6 – 0.7 times distal articles together, with 2 – 3 plumose setae on lateral margin. Uropod (Fig. 9 N) peduncle 2.4 – 3.0 times pleonite 6, 2.6 – 2.7 times exopod and 2.0 – 2.2 times endopod, with 8 – 9 setae on inner margin; exopod 0.8 times endopod, with ciliated seta on inner margin and 2 terminal setae; endopod uni-articulate, with 10 spiniform setae on inner margin and terminal seta.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	discussion	Remarks. The original description of Campylaspis crispa was based on female specimens from Petra Verikogo, Russian coast of the Sea of Japan (Lomakina, 1955). Akiyama (2014) did not assign Japanese specimens (Campylaspis sp. 1) to C. crispa, due to the different lengths of the uropod peduncle to the endopod (twice in Japanese specimens, three times in Russian specimens). However, on closer inspection, considerable variation in the ratio (2.1 – 2.7 to endopod) in the Japanese specimens shows that they should be identified as C. crispa. Female specimens of Campylaspis crispa closely resemble females of Campylaspenis sigeogamoi, but are distinguished by (1) 3 oblique ridges on carapace distinct (weak in C. sigeogamoi), (2) anterior end of scale-like sculpture on carapace not forming minute spine (forming minute spine directed outward in C. sigeogamoi), and (3) uropod peduncle not slender (slender in C. sigeogamoi). Comparing the specimens from the same sediment sample (KT- 11 - 9, St. E 3), the total body length of C. crispa (3.8 – 4.3 mm in ovigerous females, 3.9, 4.1 mm in preparatory female, 4.7 – 5.2 mm in adult males) was larger than C. sigeogamoi (3.0 – 3.4 mm in ovigerous females, 3.8 – 3.9 mm in adult males). In adult male specimens, a pair of large genital pores are present on the ventral surface of pereonite 5, as is also found in Campylaspis brevirostris.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD0FFD7D0DBFB94ACE4733D.taxon	distribution	Distribution. Russian and Japanese coast of the Sea of Japan, 10 – 994 m in Russia and 198 – 808 m in Japan.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD5FFC8D0DBFB40AA1572A5.taxon	description	(Fig. 10)	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD5FFC8D0DBFB40AA1572A5.taxon	diagnosis	Diagnosis. Females; carapace antero-posteriorly compressed, each side with 3 weak oblique ridges; broad transverse ridge running on frontal lobe; upturned pseudorostrum very short, 0.034 – 0.039 times carapace length; eye lobe semicircular. Maxilliped 3 basis inner distal corner projected; merus, carpus and dactylus serrate on inner margin. Pereopod 1 basis inner distal corner projected. Uropod peduncle 1.50 – 1.63 pleonite 6, 1.9 – 2.1 times endopod; exopod longer than endopod. Male. Pereonite 5 with genital pores on ventral surface. Maxilliped 3 propodus with finger-like process. Uropod peduncle 2.3 times pleonite 6 and 1.9 times endopod.	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD5FFC8D0DBFB40AA1572A5.taxon	materials_examined	Material examined. 1 adult male, 3.3 mm (NSMT Cr- 32970), off Esashi, northern coast of Hokkaido, the Sea of Japan, 41 ° 47.46 ΄ N, 139 ° 34.49 ΄ E – 41 ° 48.96 ΄ N, 139 ° 34.88 ΄ E, 563 – 605 m, (KT- 11 - 9, St. E 3), 29 May 2011. Other material. 1 preparatory female, 2 juveniles, 3 manca, Toyama Bay, 37 ° 28.45 ΄ N, 137 ° 28.15 ΄ E – 37 ° 29.18 ΄ N, 137 ° 28.86 ΄, 160 – 173 m, 31 May 2011 (KT- 11 - 9, St. T 1); 3 ovigerous females, 7 preparatory females, 2 subadult males, 11 juveniles, 4 manca, Toyama Bay, 37 ° 29.18 ΄ N, 137 ° 33.25 ΄ E – 37 ° 29.35 ΄ N, 137 ° 31.96 ΄ E, 383 – 460 m, 31 May, 2011 (KT- 11 - 9, St. T 3); 4 ovigerous females, 3 preparatory females, 2 subadult males, 6 juveniles, 1 manca, Toyama Bay, 37 ° 19.80 N, 137 ° 33.38 ΄ E – 37 ° 20.02 ΄ N, 137 ° 34.20 ΄ E, 561 – 583 m, 1 June, 2011 (KT- 11 - 9, St. T 4); 9 ovigerous females, 2 preparatory females, 1 subadult male, 8 juveniles, Toyama Bay, 37 ° 18.45 ΄ N, 137 ° 31.77 ΄ E – 37 ° 18.66 ΄ N, 137 ° 32.85 ΄ E, 794 – 808 m, 1 June, 2011 (KT- 11 - 9, St. T 5); 1 subadult male, 3 juveniles, 1 manca, north of Noto Peninsula, 37 ° 57.06 ΄ N, 136 ° 56.60 ΄ E – 37 ° 57.04 ΄ N, 136 ° 58.23 ΄ E, 201 – 203 m, 1 June, 2011 (KT- 11 - 9, St. N 2); 5 ovigerous females, 1 preparatory female, 4 juveniles, north of Noto Peninsula, 38 ° 03.25 ΄ N, 136 ° 53.39 ΄ E – 38 ° 03.82 ΄ N, 136 ° 55.13 ΄ E, 402 – 411 m, 1 June, 2011 (KT- 11 - 9, St. N 3); 1 preparatory female, 2 subadult males, 6 juveniles, 1 manca, north of Noto Peninsula, 38 ° 08.04 ΄ N, 136 ° 49.64 ΄ E – 38 ° 09.00 ΄ N, 136 ° 51.20 ΄ E, 603 – 622 m, 1 June, 2011 (KT- 11 - 9, St. N 4).	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD5FFC8D0DBFB40AA1572A5.taxon	discussion	Remarks. An additional adult male specimen found in the present study agrees well with a male specimen in the original description (Akiyama, 2014). A noteworthy character is a pair of large genital pores on the ventral surface of pereonite 5 (arrowhead in Fig. 10 A), also found in C. crispa. Campylaspis brevirostris closely resembles C. bacescui from the southern coast of Argentine, Falkland Isles, Straight of Magellan, 82 – 361 m, western Atlantic, but is distinguished by (1) lower margin of carapace serrated in both sexes (anterior half of lower margin serrated in female, not serrated in male of C. bacescui), (2) carapace of adult male is not dorso-ventrally compressed, but is spherical (dorso-ventrally compressed in C. bacescui), (3) propodus of maxilliped 3 with finger-like process in adult male (without finger-like process in C. bacescui).	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
03C1879BFFD5FFC8D0DBFB40AA1572A5.taxon	distribution	Distribution. Japanese coast of the Sea of Japan, 160 – 808 m	en	Akiyama, Tadashi (2025): On some species of the genera Campylaspenis and Campylaspis (Crustacea, Cumacea, Nannastacidae) from the Sea of Japan (Northwest Pacific), with description of a new species of Campylaspenis. Zootaxa 5665 (4): 543-562, DOI: 10.11646/zootaxa.5665.4.3, URL: https://doi.org/10.11646/zootaxa.5665.4.3
