Ampelisca meridionalis Valério-Berardo, 2007, sp. nov.
Creators: name: Valério-Berardo, Maria Teresa
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampeliscidae
Ampelisca
Ampelisca meridionalis

description: Ampelisca meridionalis sp. nov.
(Figs. 3–4)
Material examined: Holotype, female, 15 mm, 34º32’S – 53º33’W, 29 m, sand and broken shell, RV Almirante Saldanha, 04/XI/69, MZUSP 17218. Paratypes: 24°20’S – 45°12’W, 78m, sand and broken shell, RV Almirante Saldanha, 24/IX/1969, MZUSP 17219, 1 female; 34°32’S – 53º33’W, 29 m, sand and broken shell, RV Almirante Saldanha, 04/XI/69, MNRJ 20456, 1 female.
Etymology: The species is named in reference to the latitudinal region where the specimens are recorded.
Diagnosis: Head with anteroventral and anterodorsal margins parallel. Antenna 1 subequal in length to peduncle antenna 2. Pereopod 7 basis posterior margin oblique and pointed, reaching to middle of carpus, with plumose setae on posterodistal margin, carpus anterior margin slightly notched with 1 robust seta on notch, propodus longer than carpus, twice longer than wide. Epimeron 3 posteroventral corner quadrate. Urosomite 1 with saddle-shaped dorsal carina. Uropod 2 outer ramus with 1 long apical robust seta. Uropod 3 rami broad and foliaceous, with long plumose setae. Telson deeply cleft, apices of lobes notched.
Description: Holotype female, 15mm. Head (Fig. 3) shorter than first 3 body segments combined, anterior margin narrow, anteroventral and anterodorsal margins parallel. Antenna 1 (Fig. 3) subequal in length to peduncle antenna 2; flagellum with 19 articles. Antenna 2 (fig. 3) shorter than body length, peduncular article 4 longer than article 5; flagellum with 24 articles. Mandible (Fig. 3) with 10 robust setae in the accessory setal row; mandibular palp elongate, article 2 slightly inflated proximally, with setae on both margins, article 3 as long as article 2, with medial and apical setae. Maxilla 1 (Fig. 3) inner plate with two apical plumose setae; outer plate with 9 setal-teeth; palp article 2 provided with 3 distal cusps accompanied by 7 robust setae and 4 facial setae. Maxilliped (Fig. 3) inner plate rectangular distally, with apical and subapical rows of plumose setae; outer plate reaching to end of palp article 2, with 9 chisel-shaped robust setae along medial margin, apical margin with 2 robust setae and plumose setae; palp article 4 inserted at midlength of the article 3. Upper lip, lower lip and maxilla 2 (Fig. 3) with basic characters for the genus.
Coxae 1 – 4 longer than broad. Coxa 1 (Fig. 1) with 1 notch on posteroventral corner. Coxae 1 and 2 with a marginal row of setae on ventral margin. Coxae 3 and 4 with sparse and short setae on ventral margin. Gnathopod 1 (Fig. 3) basis slightly inflated distally, with a row of simple setae on posterior margin; isquium and merus with setae on posterior margin; carpus longer than propodus (1.2 X), posterior margins of both articles with a row of simple and pectinate setae, anterior margins with sparse simple setae; dactylus curved, with 3 setules along inferior margin. Gnathopod 2 (Fig. 3) basis inflated distally, with long setae on both margins; carpus longer than propodus (1.8 X), both articles with setae on posterior margins; dactylus curved, with 2 setules along inferior margin. Pereopods 3 and 4 (Fig. 4) similar in shape but forth is more massive and setose than third pereopod, both pereopods with dactyli longer than combined lengths of propodus and carpus (1.6 X). Pereopod 3 merus with plumose setae along half posterior margin. Pereopod 4 basis and merus with rows of plumose setae on posterior margins; merus length 2 X breadth, with rows of plumose setae on both margins. Pereopod 5 (Fig. 4) basis subquadrate, anterior margin with simple and plumose setae; carpus subequal in length to propodus, posterodistal margin produced and bearing 2 long setae and 5 short robust setae, posterior margin with 2 set of comb robust setae; propodus with setae along anterior margin, posterior margin with 3 robust setae; dactylus short, with 3 apical cusps. Pereopod 6 (Fig. 4) basis subquadrate, anterior margin with short plumose and simple setae; carpus slightly longer than propodus, posterodistal margin produced and bearing 2 long and 4 short robust setae; anterior margins of carpus and propodus with rows of robust setae and 2 long apical setae; dactylus short, with 3 apical cusps. Pereopod 7 (Fig. 4) basis posterodistal margin oblique and pointed, reaching to middle of carpus, with plumose setae; merus slightly longer than isquium, posterior lobe weakly produced, with plumose setae; carpus anterior margin slightly notched with 1 robust seta on notch, anterodistal corner with 3 robust setae; propodus longer than carpus, not stout, length 2 X breadth, with 3 robust setae on both distal margins; dactylus shorter than propodus (0.7 X) and curved anteriorly.
Epimeron 3 (Fig. 4) posteroventral corner quadrate. Urosomite 1 (Fig. 4) with saddle-shaped dorsal carina. Uropod 1 (fig. 4) reaching to the end of uropod 2, peduncle as long as rami, inner margin with 6 robust setae; rami subequal in length; inner ramus with 3 robust setae on inner margin; outer ramus nacked. Uropod 2 (Fig. 4) peduncle longer than rami, with 1 apical robust seta on inner margin; inner ramus shorter than outer ramus, inner margin with a row of robust setae; outer ramus with 3 setae on outer margin and 1 long apical robust seta. Uropod 3 (Fig. 4) peduncle with 3 apical robust setae on inner margin; rami broad and foliaceous, longer than peduncle, subapical and apical margins of both rami with long plumose setae. Telson (Fig. 4) deeply cleft (0.8 X), apices of lobes notched, each notch bearing 1 robust seta.
Remarks. Ampelisca meridionalis sp. nov. is closely related to Ampelisca bicarinata Goeke and Heard, 1983, Ampelisca cristata Holmes, 1908 A. cristoides Barnard, 1954 and A. flabellicaudata Valério-Berardo & Wakabara, 2006, in having head anteroventral and anterodorsal margins parallel, urosomite 1 with a dorsal carina, uropod 2 outer ramus with a long apical robust setae and uropod 3 rami foliaceous and setose. However, Ampelisca meridionalis. sp. nov. can be distinguished from these species by pereopod 7 basis posterior margin oblique and pointed, reaching to middle of carpus and carpus anterior margin notched with 1 robust seta on notch.
Also there are clear distinctions between Ampelisca meridionalis sp. nov. with A. cristoides, A. cristata and A. flabellicaudata by size and setation of uropods and slender propodus of pereopod 7. In addition Ampelisca meridionalis is easily distinguished from A. bicarinata, A. cristata and A. cristoides by epimeron 3 posteroventral corner quadrate, without spine. Ampelisca meridionalis sp. nov also differs from A. flabellicaudata by urosmite 1 carina saddle-shaped and foliaceous uropod 3 rami.
description: Published as part of Valério-Berardo, Maria Teresa, 2007, Description of three new species of Ampelisca (Crustacea: Amphipoda: Ampeliscidae) from Southwestern Atlantic, with a key of the genus for Brazilian species, pp. 25-37 in Zootaxa 1626 on pages 30-31, DOI: 10.5281/zenodo.179283