The family Aristiidae (Crustacea: Amphipoda: Lysianassoidea) in Australian waters Author Stoddart, H. E. helen.stoddart@austmus.gov.au Author Lowry, J. K. text Zootaxa 2010 2010-07-26 2549 1 31 53 https://biotaxa.org/Zootaxa/article/view/zootaxa.2634.1.5 journal article 10.11646/zootaxa.2634.1.5 1175-5326 Aristias gomoni sp. nov. ( Figs 4–6 ) Type material . HOLOTYPE , female, 7.5 mm , MV J59372 , south of Point Hicks , Victoria , Australia , 38°17.70'S 149°11.30'E , 400 m , coarse sand, gravel, mud, many sponges, WHOI epibenthic sled, 24 July 1986 , M.F. Gomon et al. , RV Franklin , stn SLOPE 40 . PARATYPES : 5 females , MV J59373 , and 1 female , 6.5 mm , AM P.81145, same data as holotype ; 2 specimens , female, 5.5 mm and immature, 3.5 mm , AM P68502, Ling Hole , off west coast of Tasmania , Australia , 41°23’29”S 144°21’24”E to 41°24’18”S 144°19’15”E , 330 m , Sherman sled, associated with anemones, 20 April 2004 , CSIRO party, RV Southern Surveyor , stn SS 04/04/51 . Type locality . South of Point Hicks , Victoria , Australia , 38°17.70'S 149°11.30'E , 400 m depth . Etymology . The species is named for Martin Gomon who collected the type specimen. Diagnostic description . Head lateral cephalic lobe broadly triangular, apically subacute; eyes well developed, reniform. Antenna 1 accessory flagellum 4-articulate. Epistome and upper lip with central notch . Mandible lacinia mobilis present on left mandible; molar a weakly setose flap. Maxilla 1 inner plate with 8 pappose setae along inner margin; outer plate with 14 setal-teeth in a 12/2 arrangement, most with many cusps. Maxilliped palp 4-articulate, palp article 1 with lateral margin much longer than medial margin. FIGURE 4. Aristias gomoni sp. nov. Paratype, female, 6.5 mm, AM P.81145. Gnathopod 1 parachelate; carpus subequal in length to propodus, without posterodistal lobe; propodus posterior margin dentate, with 5 robust setae along posterior margin. Gnathopod 2 carpus longer than propodus. Pereopods 5–7 propodus with anterodistal spur. Pereopod 5 coxa posterior lobe deeper than anterior lobe, short, triangular; basis moderately expanded posteriorly, with posteroventral lobe. Pereopod 6 coxa posterior lobe deeper than anterior lobe, short, triangular; basis greatly expanded posteriorly, with posteroventral lobe. Pereopod 7 basis greatly expanded posteriorly, posterior margin abruptly tapered distally, with posteroventral lobe, posteroventral corner rounded. Epimeron 3 posterior margin smooth, posteroventral corner narrowly rounded . Urosomite 1 with an anterodorsal depression and a rounded dorsodistal boss . Urosomite 3 without dorsolateral flanges. Uropod 3 rami with robust setae only on apices of outer ramus article 1; inner ramus about as long as article 1 of outer ramus. Telson shorter than broad, moderately cleft , without mid-dorsal robust setae, lateral margins curved, uniformly tapering distally, without robust setae on lateral margins, without apical robust setae. Remarks . Based on pereopods 5–7 propodus each with a spur, pereopod 7 basis with a tapering posterior margin and epimeron 3 with a narrowly rounded posteroventral corner, A. gomoni is similar to A. stenopodus from just north of Madagascar and to A. verdensis from the Philippine Islands . Aristias gomoni is distinguished from these species by the large number of setal-teeth (14) on the outer plate of maxilla 1. Distribution . South-eastern Australia in 330–429 m depth.