Aristias otway Stoddart &amp; Lowry 2010, sp. nov.
Creators: name: Stoddart, H. E.
name: Lowry, J. K.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Aristiidae
Aristias
Aristias otway

description: <i>Aristias otway</i> sp. nov. (Figs 10–12) <b>Type material.</b> HOLOTYPE, female with nonsetose oostegites, 2.8 mm, MV J61977, 25 km south of Cape Otway, Victoria, Australia, 39°07.6’S 143°25.0’E to 39°08.3’S 143°20.6’E, 55–84 m, fine sand, otter trawl, 31 January 1981, M. Gomon <i>et al</i>., FRV <i>Hai Kung</i>, stn BSS 119. PARATYPES: 1 male, 2.8 mm, MV J59375 and 1 immature, MV J59376, same data as holotype; 1 female, AM P.81146, 44 km south-west of Cape Otway, Victoria, Australia, 39°06.3’S 142°55.6’E, 81 m, medium sand, 21 November 1981, R. Wilson, RV <i>Tangaroa</i>, stn BSS-192. <b>Type locality.</b> 25 km south of Cape Otway, Victoria, Australia, 39°07.6’S 143°25.0’E to 39°08.3’S 143°20.6’E, 55–84 m depth. <b>Etymology.</b> The species is named for its type locality. <b>Diagnostic description.</b> <i>Head</i> lateral cephalic lobe broadly triangular, apically rounded; eyes well developed, oval. <i>Antenna 1</i> accessory flagellum 2-articulate. <i>Antenna 2</i> calceoli not present in male. <b> <i>Epistome and upper lip</i> with central notch</b> . <i>Mandible</i> lacinia mobilis present on left mandible; molar absent. <i>Maxilla 1</i> inner plate with 3 pappose setae along inner margin; <b>outer plate with 7 setal-teeth</b> in a 5/2 arrangement, <b>with no cusps</b>. <i>Maxilliped</i> palp 4-articulate, palp article 1 with lateral and medial margins about same length. <i>Gnathopod 1</i> parachelate; carpus shorter than propodus, without posterodistal lobe; propodus posterior margin dentate, with 2 robust setae along posterior margin. <i>Gnathopod 2</i> carpus longer than propodus. <i>Pereopods 5–7</i> propodus with anterodistal spur. <i>Pereopod 5</i> coxa posterior lobe deeper than anterior lobe, long, triangular; basis greatly expanded posteriorly, with posteroventral lobe. <i>Pereopod 6</i> coxa posterior lobe deeper than anterior lobe, long, triangular; basis greatly expanded posteriorly, with posteroventral lobe. <i>Pereopod 7</i> basis moderately expanded posteriorly, posterior margin evenly curved, with posteroventral lobe, posteroventral corner rounded. <b> <i>Epimeron 3</i> posterior margin smooth</b> , <b>posteroventral corner subacute</b>. <i>Urosomite 1</i> with an anterodorsal depression, without a dorsodistal boss. <i>Urosomite 3</i> without dorsolateral flanges. <i>Uropod 3</i> rami without robust setae; inner ramus longer than article 1 of outer ramus. <i>Telson</i> as long as broad, <b>moderately cleft</b>, without mid-dorsal robust setae, lateral margins straight, uniformly tapering distally, without robust setae on lateral margins, with 1 apical robust seta on each lobe. <b>Remarks.</b> <i>Aristias otway</i> is the only species known to have no sculpturing on the setal-teeth of maxilla 1. Based on the 5/2 setal-tooth arrangement of maxilla 1, the anterodistal spur on each of pereopods 5 to 7, the subacute posteroventral corner of epimeron 3 and the moderately cleft telson <i>A. otway</i> appears to be most similar to <i>A. madagascarensis</i>. The two species can be distinguished by the serrate posterior margin of epimera 2 and 3 and by the rounded telsonic lobes in <i>A. madagascarensis</i>. <b>Distribution.</b> South-eastern Australia in 55–84 m depth.
description: Published as part of <i>Stoddart, H. E. &amp; Lowry, J. K., 2010, The family Aristiidae (Crustacea: Amphipoda: Lysianassoidea) in Australian waters, pp. 31-53 in Zootaxa 2549 (1)</i> on pages 41-42, DOI: 10.11646/zootaxa.2634.1.5