A new genus and five new species of Phoxocephalidae (Crustacea: Amphipoda) from the south-east Brazilian deep sea Author Senna, André R. text Journal of Natural History 2010 2010-07-30 44 33 - 34 2075 2118 http://dx.doi.org/10.1080/00222933.2010.486081 journal article 10.1080/00222933.2010.486081 1464-5262 4652294 Genus Bathybirubius gen. nov. Diagnosis Head, rostrum weakly developed, unconstricted. Eyes present. Antenna 2, peduncle article 1 not ensiform, article 4 with two rows of facial stout setae. Right mandible, incisor with two spines; molar not triturative, with two semi-articulated setae; hump of palp small. Maxilla 1, inner plate with one slender seta; outer plate with two apical rows of cuspidate stout setae; palp bi-articulated, apically setose. Maxilla 2, inner plate slightly shorter than outer plate. Maxilliped, outer plate longer than inner plate; palp with four articulations, article 4 slender, apical nail present. Coxa 1, anterior margin convex. Gnathopods 1–2 similar, enlarged, carpus not elongated, about 1.5 times longer than broad, without eusirid attachment, propodus ovato-rectangular, palm strongly acute. Coxa 4, posterodorsal excavation present. Pereopod 5, basis expanded, subrectangular, not tapering distally. Epimeral plate 3, posteroventral corner rounded. Urosomite 3 smooth. Uropod 1, peduncle elongated, without ventroapical spike, without apical stout setae, weakly combed; rami slender, subequal in length, with one marginal row of setae, subapical accessory nail present. Uropod 2, peduncle weakly combed, with one row of marginal setae; rami, subapical accessory nail present. Uropod 3, peduncle not combed; inner ramus short, outer ramus bi-articulate, article 2 elongated, bearing two apical slender setae. Telson deeply cleft. Male unknown. Type species Bathybirubius margaretae sp. nov. Etymology The generic name is formed from a combination of the Greek prefix bathys , meaning deep, in reference to the bathymetric distribution in the deep sea of this new taxon, with the generic name Birubius , the possibly closely related Australian shallow-water genus. Gender masculine.