Podocerus setouchiensis, Arai & Ohno & Tomikawa, 2022
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publication ID |
https://dx.doi.org/10.3897/zookeys.1128.91155 |
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publication LSID |
lsid:zoobank.org:pub:2377C791-A776-4794-A26E-CA354919A921 |
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persistent identifier |
https://treatment.plazi.org/id/0A9432E7-8420-431C-8FA8-243EC74DFDF3 |
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lsid:zoobank.org:act:0A9432E7-8420-431C-8FA8-243EC74DFDF3 |
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scientific name |
Podocerus setouchiensis |
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sp. nov. |
Podocerus setouchiensis sp. nov.
Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 New Japanese name: Setouchi-doronomi View Figure 5
Material examined.
Holotype: NSMT-Cr 30866, male (5.3 mm), intertidal zone of Tsuruduki , Etajima, Hiroshima Prefecture, Japan (34.1462°N, 132.4399°E), collected by K. Tomikawa on 18 April 2019 GoogleMaps . Paratypes: NSMT-Cr 30867 (female 4.6 mm), NSMT-Cr 30868 (male 6.0 mm, G1527), NSMT-Cr 30869 (male 4.7 mm), NSMT-Cr 30870 (male 4.2 mm), data same as for holotype; NSMT-Cr 30871, 2 males (5.9 mm, 5.1 mm), intertidal zone of Gokan , Tamano, Okayama Prefecture, Japan (34.5263°N, 133.9893°E), collected by H. Ogawa on 9 April 2019 GoogleMaps .
Diagnosis.
Body weakly rugose; pereonites 6-7 and pleonites 1-2 with dorsal carina. Head dorsally smooth. Antenna 1 accessory flagellum 1-articulate. Antenna 2 flagellar article 1 elongate. Uropod 3 rami with setae. Telson shorter than wide, with 2 long robust setae apically, lower margin with short lateral setae.
Description
(male, holotype, NSMT-Cr 30866). Body (Fig. 2A-C View Figure 2 ) weakly rugose; pereonites 6-7 and pleonites 1-2 with dorsal carina. Head (Fig. 2A, C View Figure 2 ) dorsally smooth; rostrum absent; lateral cephalic lobe squarish. Gnathopod 2 palm of propodus slightly convex with long plumose setae. Uropods 1 and 2 with distoventral projection.
Antenna 1 (Fig. 3A, B View Figure 3 ) length 0.8 × body length; length ratio of peduncular articles 1-3 1.0: 2.1: 2.0; peduncular article 1 subquadrate, with long setae on posterior margin; peduncular articles 2 and 3 with 9 and 8 clusters of long setae on posterior margins, respectively; primary flagellum 6-articulate, 0.6 × peduncular articles 1-3 combined, article 1 long, 3.2 × article 2; accessory flagellum slender, 1-articulate. Antenna 2 (Fig. 3C, D View Figure 3 ) 1.5 × antenna 1; peduncular article 4 with long setae on posterior margin; peduncular article 5, 1.4 × article 4, with short setae on anterior and posterior margins; flagellum 4-articulate, 0.2 × peduncular articles 1-5 combined, article 1 slightly longer than articles 2-4 combined.
Upper lip (Fig. 3E View Figure 3 ) oval, ventral margin weakly concave, with minute setae. Lower lip (Fig. 3F View Figure 3 ) outer lobe broad, setulose; inner lobes distinct. Left and right mandibles (Fig. 3G, H View Figure 3 ) with 5-dentate incisor; molar process small, non-triturative, with a short plumose seta apically; accessory setal row with 3 setae; palp 3-articulate, length ratio of articles 1-3 1.0: 2.7: 1.9, article 1 bare, article 2 with 20 setae on ventral margin and submargin, ventral margin of article 3 lined with plumose setae, inner surface of article 3 with cluster of setae. Maxilla 1 (Fig. 3I View Figure 3 ) inner plate indistinct; outer plate rectangular with 9 serrate robust setae; palp article 2 bearing 5 robust and 6 slender setae distally. Maxilla 2 (Fig. 3J View Figure 3 ) with broad outer plate longer than inner plate, inner and outer plates bearing long plumose setae on apical margin. Maxilliped (Fig. 3K-M View Figure 3 ) inner plate subrectangular, 3 small robust setae on apical margin and 1 on subapical margin; outer plate slightly exceeding half of palp article 2, medial margin with robust setae and long plumose setae; palp 4-articulate.
Gnathopod 1 (Fig. 3N View Figure 3 ) coxa slender, subtriangular, longer than broad; basis length 3.7 × width, lacking setae on anterior and posterior margins; carpus 2.0 × broad, ventral margin weakly lobate with long setae; propodus subtriangular, length 1.9 × wide, anterior margin with 4 clusters of slender setae, posterior margin convex with 3 robust setae at palmar corner; posterior margin of dactylus 6-dentate with short setae. Gnathopod 2 (Fig. 3O View Figure 3 ) coxa quadrate; basis 1.9 × broad, weakly concave anteriorly, anterodistal corner lobate; posterodistal corner of merus produced with simple and plumose setae; carpus indistinct, fused with propodus, with setae; propodus subovate, 2.1 × wide, anterior margin with 3 clusters of setae and single seta, medial surface with numerous plumose setae, palm slightly convex with long plumose setae, distal shelf well-developed, robust seta at palm defining corner; dactylus smooth, not reaching end of palm, with short setae.
Pereopods 3 and 4 (Fig. 4A-C View Figure 4 ) basis lacking anterodistal lobe; ischium subrectangular; merus slightly shorter than carpus, anterodistal corner weakly produced; propodus longer than carpus, lacking robust setae marginally. Pereopod 5 (Fig. 4D View Figure 4 ) basis without posterodistal lobe; posterodistal corner of merus weakly produced; length ratio of merus-dactylus 1.0: 1.2: 1.8: 1.0. Pereopod 6 (Fig. 4E View Figure 4 ) basis subrectangular, length 1.4 × wide, posterodistal corner weakly lobate; posterodistal corner of merus weakly produced; length ratio of merus-dactylus 1.0: 1.2: 2.0: 0.9. Pereopod 7 (Fig. 4F View Figure 4 ) basis length 1.2 × width, posterior margin expanded; merus produced posterodistally; length ratio of merus-dactylus 1.0: 1.2: 1.7: 1.2.
Pleopods 1-3 (Fig. 4G View Figure 4 ) peduncle with short setae, inner distal corner with 4 retinacula (Fig. 4H View Figure 4 ).
Uropod 1 (Fig. 4I View Figure 4 ) biramous; peduncle 3.4 × broad, medial and lateral margins each with 4 robust setae, distoventral projection length 0.3 × peduncle; inner ramus 1.2 × peduncle, with 7 medial and 2 lateral robust setae; outer ramus 0.8 × length of inner ramus, with 3 robust setae on lateral margin. Uropod 2 (Fig. 4I View Figure 4 ) biramous; peduncle 1.3 × broad, with short distoventral projection; inner ramus 1.9 × peduncle, medial and lateral margins with 5 and 2 robust setae, respectively; outer ramus 0.7 × length of inner ramus, bearing 2 lateral robust setae. Uropod 3 (Fig. 4K View Figure 4 ) uniramous, plate-like; with 4 apical, 1 medial and 1 lateral robust setae.
Telson (Fig. 4L View Figure 4 ) length 0.9 × width, dorsal lobe with 2 long robust setae apically, lower margin with short lateral setae.
Female (paratype, NSMT-Cr 30867). Antenna 1 (Fig. 5A View Figure 5 ) length ratio of peduncular articles 1-3 1.0: 2.1: 1.9; primary flagellum 5-articulate, 0.4 × peduncular articles 1-3 combined, article 1 long, 2.0 × article 2. Antenna 2 (Fig. 5B View Figure 5 ) peduncular article 5, 1.4 × article 4; flagellum 3-articulate, 0.3 × peduncular articles 1-5 combined.
Gnathopod 1 (Fig. 5A View Figure 5 ) basis almost straight; carpus 2.3 × broad; palmar margin of propodus bearing robust seta; posterior margin of dactylus 4-dentate. Gnathopod 2 (Fig. 5B View Figure 5 ) basis with anterodistal robust setae; merus produced anterodistally with robust setae; carpus free, distinct from propodus; propodus ovate, length 1.4 × width, palm convex with 3 robust setae near palmar corner.
Etymology.
The specific name is derived from the Seto Inland Sea, where this new species is distributed.
DNA Sequence.
A sequence of COI (GenBank accession number LC719250; 658 bp) was determined from the paratype female (NSMT-Cr 30868).
Distribution.
Known from Hiroshima and Okayama Prefectures.
Remarks.
Podocerus setouchiensis sp. nov. is similar to P. andamanensis (Giles, 1890), P. casuarinensis Kilgallen, 2009, P. crenulatus Myers, 1985, P. fulanus J.L. Barnard, 1962, P. lazowasemi Baldinger & Gable, 1994, P. orontes Hughes, 2013, and P. walkeri Rabindranath, 1972 in having dorsal carinae on pereonites 6 and 7, and pleonites 1 and 2. However, this new species differs from these species by the features shown in the following key. Podocerus setouchiensis sp. nov. is also similar to P. ulreungensis Kim & Kim, 1991 from Ulleung Island in the Sea of Japan in having antenna 2 with elongate flagellar article 1, gnathopod 1 with weakly lobate carpus, male gnathopod 2 merus pointed distally, male gnathopod 2 propodus with convex palmar margin bearing long marginal setae and robust seta at palm defining corner, uropod 1 peduncle with distoventral projection, and telson with 2 apical setae. However, this new species is distinguished from the latter by the following features (features of P. ulreungensis in parentheses): pereonite 6 with dorsal carina (absent); antenna 1 accessory flagellum 1-articulate (2-articulate); antenna 1 flagellar article 1 length 3.2 times as long as article 2 (2.3 times); uropod 2 peduncle with a short distoventral projection (lacking projection); and telson shorter than wide (longer).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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