Ampelisca angraensis, Souza-Filho & Souza & Valério-Berardo, 2009

Souza-Filho, J. F., Souza, A. M. T. & Valério-Berardo, M. T., 2009, Description of four new species of the genus Ampelisca (Amphipoda, Ampeliscidae) from the northeastern and southeastern coasts of Brazil and designation of a neotype for Ampelisca soleata Oliveira, 1954, Journal of Natural History 43 (37 - 38), pp. 2391-2423 : 2392-2397

publication ID	https://doi.org/ 10.1080/00222930903100543
persistent identifier	https://treatment.plazi.org/id/FF2887CB-6D53-F802-FE0C-FA99E001FC56
treatment provided by	Felipe
scientific name	Ampelisca angraensis
status

Treatment

Genus Ampelisca Krøyer, 1842 View in CoL

Ampelisca angraensis sp. nov.

( Figures 1–3 View Figure 1 View Figure 2 View Figure 3 ) Ampelisca cristata [not Holmes 1908] Serejo et al. 2000: 498, fig. 2.

Material examined

Holotype female 9.5 mm, Angra dos Reis, Rio de Janeiro (23°05′ S, 44°20′ W), 12 m, L. R. Tommasi col., 20 March 1969, MNRJ 21516 View Materials GoogleMaps . Paratypes: Angra dos Reis, Rio de Janeiro (23°05 S, 44°20 W), 12 m, L. R. Tommasi col., 20 March 1969, MNRJ 13954 View Materials , 3 females GoogleMaps .

Etymology

This species name is derived from the type locality, Angra dos Reis, Rio de Janeiro State, southeastern Brazil .

Diagnosis

Head anteroventral margin oblique. Antenna 1 shorter than antenna 2 peduncle. Antenna 2 subequal in length to body. Pereopod 5 dactylus with one apical cusp. Pereopod 6 dactylus with three apical cusps. Pereopod 7 basis posterior margin crenulate, reaching to middle of carpus, with plumose setae on ventral margin; ischium shorter than merus; merus posterodistal lobe extending one-third of carpus; propodus longer than carpus (1.2 times), stout, length 1.5 times breadth; dactylus longer than propodus (1.1 times). Pleonite 3 bicarinate dorsally. Epimeron 3 posteroventral corner quadrate, drawn out into a spine. Urosomites 1 and 2 with dorsal margin rounded, produced. Uropod 2 outer ramus with a long apical robust seta. Uropod 3 rami foliaceous and broad, inner and apical margins of both rami serrate and with plumose setae, outer ramus with a row of robust setae along outer distal margin.

Description

Holotype, female 9.5 mm. Head ( Figure 1 View Figure 1 ) longer than deep, shorter than first three body segments combined, anteroventral margin oblique. Two pairs of corneal lenses present, strongly developed. Antenna 1 ( Figure 1 View Figure 1 ) shorter than antenna 2 peduncle, peduncular article 2 2.0 times longer than article 1 and 2.5 times longer than article 3; flagellum with 12 articles, longer than peduncle. Antenna 2 ( Figure 1 View Figure 1 ) subequal in length to body, fourth peduncular article 1.5 times longer than fifth peduncular article; flagellum with 29 articles, longer than peduncle.

Mandible ( Figure 1 View Figure 1 ) accessory setal row with seven setae; palp article 2 not inflated, both margins with long simple setae, article 3 0.8 times article 2, with setae on inner and apical margins. Maxilla 1 ( Figure 1 View Figure 1 ) inner plate with two apical setae; outer plate with 10 serrate robust setae; palp article 2 with two distal cusps accompanied by six robust setae and three facial setae. Maxilliped ( Figure 1 View Figure 1 ) inner plate rectangular distally with two robust setae, four plumose setae on distal margin and three simple setae on inner margin; outer plate reaching to middle of the palp article 3, bearing six chisel-shaped robust setae along inner margin and three apical robust setae; palp article 3 with article 4 inserted at distal mid-length, article 4 without setules on the inner margin. Upper lip, lower lip and maxilla 2 with basic characters for the genus.

Coxae 1–4 ( Figure 2 View Figure 2 ) longer than broad. Coxae 1 with a notch on posteroventral corner and distally widened. Coxae 1 and 2 with a row of plumose setae on ventral margins. Gnathopod 1 ( Figure 2 View Figure 2 ) basis weakly inflated distally, with one long simple seta on both margins; ischium and merus with setae on posterodistal margins; carpus 1.2 times propodus length, both articles with posterior margins with pinnate setae; dactylus slightly curved, with five setules pinnate along inferior margin. Gnathopod 2 ( Figure 2 View Figure 2 ) more slender than gnathopod 1, basis inflated distally, with robust setae on posterior margin; merus with two simple setae on posterodistal corner; carpus longer than propodus (1.9 times), both articles with pinnate and simple setae on posterior margins; propodus with four small pinnate setae on posterodistal margin; dactylus curved, bearing three setules pinnate along inferior margin. Pereopod 3 and 4 ( Figure 2 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 (1.3 times). Pereopod 3 merus with three long plumose setae on anterodistal margin and four long plumose setae on posterodistal margin, anterodistal corner not produced; carpus with long plumose setae on both margins; propodus with simple setae on anterodistal margin and posterior margin. Pereopod 4 basis with plumose setae on anterodistal margin and three robust setae and one plumose seta on posterior margin; merus length 2.5 times breadth, with plumose setae on both margins; carpus with plumose setae on posterodistal corner; propodus with long setae on anterodistal margin. Pereopod 5 ( Figure 2 View Figure 2 ) basis subovoid, anterior margin with four plumose setae; carpus 1.3 times longer than propodus and drawn out posterodistally, bearing three long setae on posterodistal corner; propodus anterodistal margin with two simple setae, posterior margin nacked; dactylus short, with one apical cusp. Pereopod 6 ( Figure 2 View Figure 2 ) basis subquadrate, anterior margin with two long plumose and seven short simple setae; carpus longer than propodus (1.2 times), posterodistal corner drawn out, bearing two long setae and three robust setae; anterior margins of carpus and propodus with a row of robust setae; anterodistal corner of the propodus with three long setae; dactylus short, with three apical cusps. Pereopod 7 ( Figure 3 View Figure 3 ), basis posterior margin obliquely rounded crenulate, reaching to middle of carpus, with plumose setae on ventral margin; ischium shorter than merus; merus posterodistal lobe extending one-third of carpus, lobe margin with one plumose seta; carpus anterodistal corner with one robust seta, posterodistal corner with two long plumose setae; propodus longer than carpus (1.2 times), stout, length 1.5 times breadth, anterodistal corner with one robust seta; dactylus longer than propodus (1.1 times), curved anterodistally.

Pleonite 3 dorsal margin bicarinate ( Figure 3 View Figure 3 ). Epimeron 3 ( Figure 3 View Figure 3 ) posteroventral corner quadrate, drawn out into a spine. Urosomites 1 and 2 ( Figure 3 View Figure 3 ) with dorsal margin rounded produced. Uropod 1 ( Figures 1 View Figure 1 and 3 View Figure 3 ) extending to end of uropod 2 rami, peduncle slightly shorter than rami, inner margin with three robust setae; inner ramus subequal in length to outer ramus, with five robust setae on inner margin; outer ramus naked. Uropod 2 ( Figure 3 View Figure 3 ) peduncle longer than rami, with a comb of two robust setae on apical inner corner and three robust setae on ventral margin; rami subequal in length; outer margin of inner ramus with a row of robust setae; outer ramus with a long apical robust seta and three robust setae on inner margin. Uropod 3 ( Figure 3 View Figure 3 ) peduncle shorter than rami, with two robust setae on inner margin; rami foliaceous and broad, inner and apical margins of both rami serrate and with plumose setae, outer ramus with a row of long plumose and robust setae along outer distal margin. Telson ( Figure 3 View Figure 3 ) cleft (0.5 times), each lobe notched and pointed at apex, each notch bearing two simple seta.

Remarks

Ampelisca angraensis sp. nov. is closely related to A. bicarinata Goeke and Heard, 1983 and A. pseudobicarinata sp. nov. in having pleonite 3 with bicarinate lamellar dorsal process and posteroventral corner drawn out into a short spine, uropod 3 rami foliaceous and broad. But the former differs from them by the shape of the head; antenna 1 longer than peduncular article 4 of antenna 2; acuminate chisel-shaped teeth on maxillipedal inner plate (versus blunt chisel-shaped teeth in A. bicarinata and A. pseudobicarinata sp. nov.); pereopod 5 with only one accessory cusp (numerous in A. bicarinata and A. pseudobicarinata sp. nov.) and uropod 3 rami with margins serrate and outer ramus with a row of robust setae along outer distal margin. Ampelisca angraensis also differs from A. bicarinata by uropod 2 outer ramus apical robust seta less than half the length of ramus and only three robust setae on inner margin (more than six in A. bicarinata ). The former also can be distinguished from A. pseudobicarinata sp. nov. by the shape of pereopod 7.