Ampelisca campensis, 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 : 7-10

publication ID	https://doi.org/ 10.5281/zenodo.183266
DOI	https://doi.org/10.5281/zenodo.6230601
persistent identifier	https://treatment.plazi.org/id/5B0B1C7B-FF90-FFE3-6EF7-FF647B513861
treatment provided by	Plazi
scientific name	Ampelisca campensis
status	sp. nov.

Treatment

Ampelisca campensis View in CoL sp. nov.

( Fig. 3–4 View FIGURE 3 View FIGURE 4 )

Material examined: Holotype: 1 female, 5 mm, 22º41’10,8”S – 40º2’20,3”W, 1650 m, R/V Astro Garoupa, 13/VI/2003, MNRJ 20106; Paratype: 1 female, 22º41’10,8”S – 40º2’20,3”W, 1650 m, R/V Astro Garoupa, 13/ VI/2003, MNRJ 20105.

Etymology: This species name is derived from the type locality, Campos Basin, Southeastern Brazil.

Diagnosis: Head anterior margin slightly sinuous, with anteroventral margin oblique. Corneal lenses absent. Antenna 1 shorter than antenna 2 peduncle. Antenna 2 subequal in size to the body. Coxae 1 and 2 with notch on posteroventral corners. Pereopods 5 and 6 dactyli with 1 apical cusp. Pereopod 7 basis posterior margin rounded and reaching to middle of carpus, carpus antero-distal corner slightly lobed; carpus and propodus with a robust setae on posterodistal and anterodistal corners; propodus longer than carpus and dactylus, not stout, length 2.3 X breadth. Epimeron 3 posteroventral corner rounded, without spine. Urosomite 1 with a dorsal margin rounded produced. Uropod 3 rami lanceolate, inner and apical margins of both rami with plumose setae. Telson with a robust seta on lateral margins, apices lobes bearing 1 distal robust seta.

Description: Holotype, female 5 mm. Head ( Fig. 3 View FIGURE 3 ) subequal in size to the first three body segments combined, anterior margin slightly sinuous with anteroventral margin oblique. Corneal lenses absent. Antenna 1 ( Fig. 3 View FIGURE 3 ) shorter than antenna 2 peduncle, peduncular article 2 2X longer than article 1 and 2.5X longer than article 3, without setae on ventral margin; flagellum with 7 articles. Antenna 2 ( Fig. 3 View FIGURE 3 ) subequal in size to the body, 4th and 5th peduncular articles subequal in length and both combined, longer in length than flagellum; flagellum shorter than peduncle, with 8 articles. Mandible ( Fig. 3 View FIGURE 3 ) with 6 accessory setal row; palp stout, article 2 both margins with simple and plumose setae, article 3 0.3 X article 2 with plumose setae on inner margin and simple setae on apical margin. Maxilla 1 ( Fig. 3 View FIGURE 3 ) inner plate with 2 apical plumose setae; outer plate with 8 serrate robust setae; palp article 2 with 3 distal cusps accompanied by 4 apical robust setae and 2 apical simple setae. Maxilliped ( Fig. 3 View FIGURE 3 ) inner plate rectangular with a row of plumose setae on distal margin; outer plate not reaching to end of the palp article 2, bearing 5 chisel-shaped robust setae along inner margin and 2 robust setae and simple setae on apical margin; palp normal for the genus, article 3 clavate. Upper lip, lower lip and maxilla 2 with basic characters for the genus.

Coxae 1–4 ( Fig. 3 View FIGURE 3 ) longer than broad. Coxae 1 and 2 with notch on posteroventral corners and with a row of plumose setae on ventral margins. Gnathopod 1 ( Fig. 3 View FIGURE 3 ) basis inflated distally, posterior margin with a row of simple setae and anterior margin with a row of plumose setae; merus with simple setae on posterior margin; carpus subequal in length to propodus, both articles with a row of pinnate setae; dactylus slender and slightly curved and with 3 setules along inferior margin. Gnathopod 2 ( Fig. 3 View FIGURE 3 ) slender than gnathopod 1, basis inflated distally, with long simple setae on posterior margin and plumose setae on anterior margin; carpus 1.2 X propodus length, both articles with pinnate and simple setae on posterior margins; propodus with a row of robust setae on posterodistal margin; dactylus with 3 setules on inferior margin. Pereopod 3 and 4 ( Fig. 3 View FIGURE 3 ) similar in shape but the fourth is more massive and setose than third, both with dactyli longer than combined lengths of carpus and propodus (1.3 X). Pereopod 3 merus and carpus with subapical long plumose setae on anterior and posterior margins; merus antero-distal corner not produced. Pereopod 4 basis and merus with long plumose setae on anterior and posterior margins; merus length 2.9 X breadth; carpus with long subapical plumose setae on posterior margin; propodus nacked. Pereopod 5 ( Fig. 4 View FIGURE 4 ) basis subquadrate, anterior margin with 2 long plumose setae; carpus subequal in length to propodus, posterodistal corner slightly produced, bearing 3 long setae, anterodistal corner with 2 setae; propodus with subapical setae on anterior margin; dactylus short, with 1 apical cusp. Pereopod 6 ( Fig. 4 View FIGURE 4 ) basis subrectangular, anterior margin with 2 long and 5 short simple setae; carpus shorter than propodus (0.9 X), posterodistal corner slightly produced, bearing 3 long pectinate robust setae; anterior margins of carpus and propodus with robust setae; propodus anterodistal margin with 2 long and 1 short simple setae; dactylus short, with 1 apical cusp. Pereopod 7 ( Fig. 4 View FIGURE 4 ) basis posterior margin rounded, reaching to middle of carpus, with plumose setae along posterodistal margin; isquium subequal in length to merus and both articles with 1 robust seta on anterodistal corner; merus posterodistal corner with a long plumose setae; carpus anterodistal corner slightly produced; carpus and propodus with a robust setae on posterodistal and anterodistal corners; propodus longer than carpus (1.2 X), not stout, length 2.3X breadth; dactylus shorter than propodus (0.9 X).

Epimeron 3 ( Fig. 4 View FIGURE 4 ) posteroventral corner rounded, without spine. Urosomite 1 ( Fig. 4 View FIGURE 4 ) with a dorsal margin rounded produced. Uropod 1 ( Fig. 4 View FIGURE 4 ) extending to end of uropod 2 peduncle, peduncle subequal in length to rami, inner margin with 2 robust setae; rami of the same length; inner ramus with 1 robust setae on anterior margin; outer ramus nacked. Uropod 2 ( Fig. 4 View FIGURE 4 ) peduncle longer than rami with 2 robust setae on inner margin; rami subequal in length; inner margin of inner ramus, with 2 robust setae; outer ramus with a long apical robust setae and 1 robust setae on inner margin. Uropod 3 ( Fig. 4 View FIGURE 4 ) peduncle shorter than rami, without robust setae; rami lanceolate, inner and apical margins of both rami with plumose setae, inner ramus outer margin with 1 robust seta. Telson ( Fig. 4 View FIGURE 4 ) cleft (0.6 X), with 1 robust seta on lateral margins, each lobe bearing 1 apical robust seta.

Remarks: Ampelisca campensis sp. nov. is closely related to A. abyssicola Stebbing, 1888 and A. gusta Barnard, 1961 in having antenna 1 shorter than antenna 2 peduncle, with 2nd and 3th articles as long as flagellum; eyes absent and uropod 3 rami lanceolate with long plumose setae on both margins. However the former can be distinguished from the others by epimeron 3 posteroventral corner rounded without spine, pereopod 7 basis posterior margin rounded and less setose uropods 1 and 2. In addition, Ampelisca campensis sp. nov. is distinguished from A. abyssicola by slender gnathopod 2 and pereopod 7 carpus and propodus of the same length. In addition Ampelisca campensis sp. nov. is easily distinguished form A. gusta by pereopod 7 anterior margin smooth, without notch and also by anterior margin of head slightly sinuous without the projection above antenna 1 insertion, diagnostic characteristic of A. gusta .