Octopupilla, 2007

Tomikawa, Ko, Kobayashi, Norio, Morino, Hiroshi & Mawatari, Shunsuke F., 2007, New gammaroid family, genera and species from subterranean waters of Japan, and their phylogenetic relationships (Crustacea: Amphipoda), Zoological Journal of the Linnean Society 149 (4), pp. 643-670 : 653-655

publication ID	https://doi.org/ 10.1111/j.1096-3642.2007.00277.x
DOI	https://doi.org/10.5281/zenodo.5114052
persistent identifier	https://treatment.plazi.org/id/D92D3636-4A3B-FFED-70F7-F8EEFC6BDDB8
treatment provided by	Carolina
scientific name	Octopupilla
status	sp. nov.

Treatment

OCTOPUPILLA FELIX TOMIKAWA View in CoL SP. NOV.

Type material: Holotype: female, 7.7 mm (appendages on slide and carcass in ethanol), NSMT-Cr 16655, shallow riverbed of the Koza River (33°32′10″N, 135°47′47″E), Kozagawa Town , Wakayama Prefecture, 11.iii.2004, collected by N. Matsumoto. GoogleMaps Paratypes: female, 5.9 mm (appendages on slide and carcass in ethanol), NSMT-Cr 16656, five females, 3.7–6.9 mm (ethanol), NSMT-Cr 16657, same data as holotype; two females, 6.4 mm, 5.5 mm (for each, appendages on slide and carcasses in ethanol), NSMT-Cr 16658– 16659, shallow riverbed of the Takatomi River, Kushimoto Town , Wakayama Prefecture, 19.vi.2003, collected by A. Ohtaka GoogleMaps ; two females, 6.2 mm, 5.5 mm (for each, appendages on slide and carcasses in ethanol), NSMT-Cr 16660–16661, from 60 to 80 cm depth on bank of Kaifu River (33°36′50″N, 134°19′29″E), Yoshida, Kaifu Town , Tokushima Prefecture, 6.x.2002, collected by Y. Morimoto. GoogleMaps

Etymology: The epithet of the species name is from Latin felix (happy, fortunate).

Description: Holotype, female, NSMT-Cr 16655. Head ( Fig. 7B View Figure 7 ): shorter than pereonites 1 and 2 combined; inferior antennal sinus deep, with rounded angle; eyes vestigial, represented by 8 pigment spots; rostrum short; lateral cephalic lobe rounded. Antenna 1 ( Fig. 7C View Figure 7 ): long, nearly as long as body length; peduncular articles 1, 2 and 3 with length ratios 1.0: 1.0: 0.4; article 1 length equal to head length, posterodistal part with robust seta; articles 2–3 with lateral and medial setae; accessory flagellum 4-articulate ( Fig. 7D View Figure 7 ); primary flagellum 41-articulate, articles with distal setae, calceoli and aesthetascs lacking. Antenna 2 ( Fig. 7E View Figure 7 ): about half length of antenna 1; peduncular article 3 short, not reaching middle of peduncular article 1 of antenna 1; peduncular articles 4–5 with lateral and medial setae; length of article 4 0.9 × length of article 5; flagellum 21-articulate, articles with distal setae, calceoli lacking.

Pereonites 1–7 ( Fig. 7A View Figure 7 ): smooth, with fine setae. Pleonites 1–3 ( Fig. 12A–C View Figure 12 ): smooth, with fine setae, each dorsal margin with 4 setae; pleonites 1–3 decreasing in length. Coxae: coxae 1–4 with many marginal and facial setae; posterior margin of coxa 4 widely excavate ( Fig. 10C View Figure 10 ); anterior lobe of coxae 5–6 dominant ( Fig. 11A, C View Figure 11 ); coxa 7 shallow, 0.5 × as deep as wide ( Fig. 11E View Figure 11 ). Urosomites 1–2 ( Fig. 12D, E View Figure 12 ): each dorsal margin with pair of clusters of robust setae. Urosomite 3 ( Fig. 12F View Figure 12 ): dorsal margin with a pair of robust setae and a single robust seta.

Upper lip ( Fig. 8A View Figure 8 ): ventral margin weakly rounded, with fine setae. Lower lip ( Fig. 8B View Figure 8 ): outer lobes broad, setulose, shoulder round; inner lobes partly fused, indistinct. Mandible ( Fig. 8C, E View Figure 8 ): left and right incisors 5- and 4-dentate, respectively ( Fig. 8D, F View Figure 8 ); left lacinia mobilis 4-dentate ( Fig. 8D View Figure 8 ), right lacinia bifid ( Fig. 8F View Figure 8 ); molar moderately strong, triturative, with single plumose seta (left molar broken); palp 3-articulate, articles 1, 2 and 3 with length ratios 1.0: 4.0: 3.0 on left mandible, 1.0: 3.0: 2.5 on right mandible; article 1 unarmed; article 2 with 14 or 15 submarginal setae; article 3 with cluster of A-setae, many D- setae, and 4 E-setae, with setulose outer face. Maxilla 1 ( Fig. 8G, H View Figure 8 ): inner plate triangular, with 14 medial plumose setae; outer plate with 11 robust serrate setae ( Fig. 8K View Figure 8 ); palp 2-articulate, longer than outer plate; article 1 unarmed; article 2 of right maxilla 1 with 7 robust setae and 3 slender setae ( Fig. 8I View Figure 8 ); article 2 of left maxilla 1 with 6 robust setae and slender seta ( Fig. 8J View Figure 8 ). Maxilla 2 ( Fig. 8L View Figure 8 ): inner plate with 13 plumose facial setae in oblique row. Maxilliped ( Fig. 8M View Figure 8 ): inner plate reaching end of palp article 1, quadrate, with 3 apical, and 1 robust subapical setae, and associated setae; medial margin with row of plumose setae in distal half ( Fig. 8N View Figure 8 ); outer plate narrowing distally, reaching half of palp article 2, with row of robust setae extending from apex along medial margin ( Fig. 8O View Figure 8 ); palp 4-articulate; article 2 long, length 1.8 × length of article 1 and 1.3 × length of article 3; both articles medially setose; article 3 with rugose apical lobe.

Gnathopods: dissimilar in size and form. Gnathopod 1 ( Fig. 9A View Figure 9 ): anterior and posterior margins of basis with long setae; ischium and merus short, ventral margin of merus setose; carpus about equal to propodus in length, not lobate, with medial setae, ventral margin lined with setae; propodus stout, palm lined with small triangular protuberances and setae, inner and outer distal corners each with 3 robust setae ( Fig. 9B View Figure 9 ); dactylus thick, curved, posterior margin smooth ( Fig. 9C View Figure 9 ). Gnathopod 2 ( Fig. 9D View Figure 9 ): posterior margin of basis with long setae; ischium and merus more slender than those of gnathopod 1; carpus long, length 1.2 × length of propodus, not lobate, with medial setae, ventral margin lined with setae; propodus more slender than that of gnathopod 1, palm lined with small triangular protuberances and setae, inner and outer distal corners each with 3 robust setae ( Fig. 9E View Figure 9 ); dactylus thick, curved, posterior margin smooth ( Fig. 9F View Figure 9 ).

Pereopod 3 ( Fig. 10A View Figure 10 ): slender, posterior margin of basis with long setae; ischium short, almost as long as wide; length ratios of merus, carpus and propodus = 1.0: 0.8: 0.8, with short setae marginally; dactylus length 0.3 × length of propodus, with 2 setae ( Fig. 10B View Figure 10 ). Pereopod 4 ( Fig. 10C View Figure 10 ): like pereopod 3, except: length ratios of merus, carpus, and propodus = 1.0: 0.9: 0.8; dactylus with three setae. Pereopod 5 ( Fig. 11A View Figure 11 ): anterior margin of basis with robust setae, posterior margin with short setae, posteroventral lobe rounded; ischium short, almost as long as wide; length ratios of merus, carpus and propodus = 1.0: 1.4: 1.6; dactylus length 0.3 × length of propodus, with 2 setae ( Fig. 11B View Figure 11 ). Pereopod 6 ( Fig. 11C View Figure 11 ): like pereopod 5, except: ischium short, length 0.8 × width; length ratios of merus, carpus and propodus = 1.0: 1.3: 1.6; dactylus slender, length 0.3 × length of propodus, with 2 setae ( Fig. 11D View Figure 11 ). Pereopod 7 ( Fig. 11E View Figure 11 ): like pereopod 5, except: ischium short, length 0.7 × width; length ratios of merus, carpus and propodus = 1.0: 1.5: 1.8; dactylus stout, length 0.2 × length of propodus, with 2 setae ( Fig. 11F View Figure 11 ).

Brood plates: narrow, lacking brood setae, on pereopods 2–5. Pleopods ( Fig. 11G, J, K View Figure 11 ): peduncle and rami long; retinacula paired, without associated setae ( Fig. 11H View Figure 11 ); inner basal margin of inner ramus of pleopods 1–3 with 3, 3, and 2 bifid setae, respectively ( Fig. 11I View Figure 11 ); outer ramus 13-, inner ramus 11-articulate. Epimeral plates 1–3: not pointed posterodistally. Epimeral plate 1 ( Fig. 12G View Figure 12 ): posterior margin with 2 setae. Epimeral plate 2 ( Fig. 12H View Figure 12 ): posterior margin with 3 setae, ventral submargin with single robust seta. Epimeral plate 3 ( Fig. 12I View Figure 12 ): posterior margin with 4 setae, ventral submargin with 2 robust setae.

Uropod 1 ( Fig. 12J View Figure 12 ): length of peduncle 1.5 × length of inner ramus, with robust setae on dorsolateral and dorsomedial margins, and with 3 basofacial robust setae; length of outer ramus 0.9 × length of inner ramus, outer and inner margins with 1 and 2 robust setae, respectively; outer and inner margins of inner ramus each with 2 robust setae, ventral margin with single slender seta. Uropod 2 ( Fig. 12K–M View Figure 12 ): length of peduncle 1.1 × length of inner ramus, with robust setae on dorsolateral and dorsomedial margins; length of outer ramus 0.7 × length of inner ramus, outer and inner margins each with single robust seta; outer and inner margins of inner ramus with 1 and 2 robust setae, respectively. Uropod 3 ( Fig. 12N View Figure 12 ): length of peduncle 0.5 × length of inner ramus, with 3 robust setae; outer ramus 2-articulate, terminal article distinct, length 0.3 × length of proximal article ( Fig. 12P View Figure 12 ); outer margin of proximal article with pair and 4 clusters of robust setae, inner margin with 5 plumose setae, single simple seta, single robust seta, and 5 pairs of robust setae; inner ramus long, length 0.7 × length of outer ramus, outer margin with 3 plumose setae, single simple seta, and 4 robust setae. Telson ( Fig. 7F View Figure 7 ): length 1.1 × basal maximum width, dorsolateral margins with 3 robust setae and 2 fine setae, each lobe with 3 or 4 robust setae apically in 1 row; cleft 63%.