Ampelisca wakabarae, Valério-Berardo, Maria Teresa, 2008

Valério-Berardo, Maria Teresa, 2008, Six new species of deep water Ampeliscidae (Crustacea: Amphipoda) from Brazilian Coast, Zootaxa 1844, pp. 1-24 : 3-4

publication ID	https://doi.org/ 10.5281/zenodo.183266
DOI	https://doi.org/10.5281/zenodo.6230599
persistent identifier	https://treatment.plazi.org/id/5B0B1C7B-FF94-FFEE-6EF7-FB3C7D493A47
treatment provided by	Plazi
scientific name	Ampelisca wakabarae
status	sp. nov.

Treatment

Ampelisca wakabarae View in CoL sp. nov.

( Figures 1–2 View FIGURE 1 View FIGURE 2 )

Material examined: Holotype: female, 6 mm, 22°04’ 33,9 S – 39°52’05,1”W, 1050 m, R/V Astro Garoupa, 31/ VI/2003, MNRJ 20103; Paratype: 1 female, 22°27’31,62”S – 40°09’23,19”W, 750 m, R/V Astro Garoupa, 21/ XII/2002, MNRJ 20539.

Etymology: named in tribute of Dr Yoko Wakabara one of the pioneers in the studies of amphipods in Brazil.

Diagnosis: Head with anteroventral margin oblique. Antenna 1 shorter than antenna 2 peduncle. Antenna 2 longer than body. Coxae 1 and 2 with notch on posteroventral corners. Pereopod 5 and pereopod 6 dactyli with 2 apical cusps. Pereopod 7, basis posterior margin obliquely rounded and reaching middle of carpus, propodus longer than carpus, not stout, length 2.0 X breadth, dactylus shorter than propodus. Epimeron 3 posteroventral corner quadrate with 1 spine. Urosomite 1 a posterodorsal margin produced. Uropod 2 outer ramus shorter than inner ramus, with a long apical robust seta. Uropod 3 outer ramus with a row of long plumose and robust setae along outer distal margin. Telson each lobe notched and pointed at apex, each notch bearing 1 robust seta.

Description: Holotype, female 6 mm. Head ( Fig. 1 View FIGURE 1 ) longer than deeper, shorter than first three body segments combined, anteroventral margin oblique. Two pairs of corneal lenses present, weakly developed. Antenna 1 ( Fig. 1 View FIGURE 1 ) shorter than antenna 2 peduncle, peduncular article 2 1.8 X longer than article 1 and 2 X longer than article 3, without setae on ventral margin; flagellum with 6 articles, longer than peduncle. Antenna 2 ( Fig.1 View FIGURE 1 ) longer than body, 4th and 5th peduncular articles subequal in length; flagellum with 20 articles, longer than peduncle. Mandible ( Fig. 1 View FIGURE 1 ) with 8 accessory setal row; palp article 2 not inflated, inner margin with long simple setae, article 3 0.5 X of article 2, with setae on inner and apical margins. Maxilla 1 ( Fig. 1 View FIGURE 1 ) inner plate with 3 apical setae; outer plate with 7 serrate robust setae; palp article 2 with 3 distal cusps accompanied by 6 robust setae and 3 facial setae. Maxilliped ( Fig. 1 View FIGURE 1 ) inner plate rectangular distally with 2 robust setae, 2 plumose setae and 5 simple setae on distal margin; outer plate reaching to end of the palp article 2, bearing 9 chisel-shaped robust setae along inner margin and 3 apical robust setae; palp article 3 with article 4 inserted at midlength, article 4 with 3 setules on the inner margin. Upper lip, lower lip and maxilla 2 with basic characters for the genus.

Coxae 1–4 ( Fig. 1 View FIGURE 1 ) longer than broad. Coxae 1 and 2 with a row of plumose setae on ventral margins and with notch on posteroventral corners. Coxa 1 distally widened. Gnathopod 1 ( Fig. 1 View FIGURE 1 )basis inflated distally, with long simple and plumose setae on both margins; ischium and merus with plumose and simple setae on posterodistal margins; carpus 1.1 X propodus length, both articles with posterior margins with pinnate setae; dactylus slightly curved, with 4 setules along inferior margin. Gnathopod 2 ( Fig. 1 View FIGURE 1 ) slender than gnathopod 1, basis inflated distally, with long simple and plumose setae on both margins; merus with plumose and simple setae on posterior margin; carpus longer than propodus (1.9 X), both article with pinnate and simple setae on posterior margins; dactylus curved, bearing 4 setules along inferior margin. Pereopod 3 and 4 ( Figs. 1 – 2 View FIGURE 1 View FIGURE 2 ) similar in shape but the fourth is more massive and setose than third, both with dactyli longer than combined lengths of carpus and propodus (1.2 X). Pereopod 3 merus with 2 subapical long plumose setae on anterior margin and 4 long plumose setae on posterodistal margin, anterodistal corner not produced; carpus with long plumose setae on posterior margin; propodus with simple setae on anterodistal margin. Pereopod 4 basis with simple setae on anterodistal margin, basis and isquium with long plumose setae on posterior margin; merus length 3 X breadth, with plumose setae on both margins; carpus with plumose setae on posterior margin; propodus with plumose setae on anterodistal margin. Pereopod 5 ( Fig. 2 View FIGURE 2 ) basis subovoid, anterior margin with 2 long setae; carpus subequal in length to propodus and not produced posterodistally, bearing 3 long setae on posterodistal corner, with a row of short setae along anterior nargin; propodus anterodistal margin with a row of setae, posterior margin with 2 robust setae; dactylus short, with 2 apical cusps. Pereopod 6 ( Fig. 2 View FIGURE 2 ) basis subquadrate, anterior margin with 1 long and 5 short simple setae; carpus longer than propodus (1.2 X), posterodistal corner produced, bearing 3 long setae; anterior margins of carpus and propodus with a row robust setae; propodus anterodistal corner with 3 long setae; dactylus short, with 2 apical cups. Pereopod 7 ( Fig. 2 View FIGURE 2 ), basis posterior margin obliquely rounded, reaching to middle of carpus, with plumose setae on posterior margin; ischium shorter than merus; merus posterodistal lobe extending middle of carpus, lobe margin with 2 plumose setae; carpus anterodistal corner with 1 robust setae, posterodistal corner with 1 robust seta and 1 long plumose seta; propodus longer than carpus (1.2 X), not stout, length 2.0X breadth, anterodistal and posterodistal corners with 2 robust setae; dactylus shorter than propodus (0.9 X), curved anterodistally.

Epimeron 3 ( Fig. 2 View FIGURE 2 ) posteroventral corner quadrate, with 1 spine. Urosomite 1 ( Fig. 2 View FIGURE 2 ) with dorsal margin produced. Uropod 1 ( Fig. 2 View FIGURE 2 ) extending to end of uropod 2 rami, peduncle slightly shorter than rami, inner margin with 5 robust setae; inner ramus subequal in length to outer ramus, with 5 robust setae on inner margin; outer ramus nacked. Uropod 2 ( Fig. 2 View FIGURE 2 ) peduncle longer than rami, with a comb of 3 robust setae on apical inner corner; inner ramus longer than outer ramus, outer margin with a row robust setae; outer ramus with a long apical robust seta and 2 robust setae on inner margin. Uropod 3 ( Fig. 2 View FIGURE 2 ) peduncle shorter than rami, without robust setae; rami foliaceous, inner and apical margins of both rami with plumose setae, outer ramus with a row of long plumose and robust setae along outer distal margin. Telson ( Fig. 2 View FIGURE 2 ) cleft (0.7 X), each lobe notched and pointed at apex, each notch bearing 1 robust seta.

Remarks. The Ampelisca wakabarae sp. nov. does appear to be closely related to A. australis Haswell, 1879 , A. dimbola Lowry & Poore, 1985 and A. parapacifica Goeke & Heard, 1984 in has uropod 3 rami foliaceous with a row of the robust setae on outer margin of outer ramus; antenna 1 shorter than peduncle antenna 2; uropod 2 outer ramus with a long apical robust seta and epimeron 3 postero-ventral corner projecting 1 spine. But the new species can be distinguished from them, by the long posteroventral lobe on basis of the pereopod 7. In addition Ampelisca wakabarae sp. nov. differs from A. parapacifica by head shape, pereopod 7 carpus with anterior margin without notch and only 2 apical cups on dactylus of pereopod 5 (versus 7 apical cups in A. parapacifica ). Also, the former can be distinguished from A. australis and A. dimbola by pereopod 7 with ischium shorter than merus and slender propodus, and dorsal surface of the telson devoid of setae.