Ocosingo yatala, Lowry & Stoddart, 2012

Lowry, J. K. & Stoddart, H. E., 2012, Australian and South African conicostomatine amphipods (Amphipoda: Lysianassoidea: Lysianassidae: Conicostomatinae subfam. nov.), Zootaxa 3248 (1), pp. 43-65 : 52-56

Ocosingo yatala sp. nov.

( Figs 5–7 )

Type material. HOLOTYPE, ovigerous female, 2.5 mm, MV J62538 , 20 km east-north-east of Bold Head , King Island, central Bass Strait, Australia, 40°0.0’S 144°20.9’E to 40°0.0’S 144°23.6’E, 46–48 m, medium sand, otter trawl, 2 February 1981, M.F. Gomon, G.C.B. Poore & C.C. Lu, FRV Hai Kung, stn BSS-127 T . PARATYPES: 1 specimen, MV J11274 , 79 km south-south-east of Port Fairy , Victoria, Australia, 39°02’S 142°38’E, 119 m, coarse sand, Smith-McIntyre grab, 9 October 1980, G.C.B. Poore, HMAS Kimbla , stn BSS-64G ; 1 specimen, MV J 62539 , 100 km north-east of North Point, Flinders Island, eastern Bass Strait , Australia, 38°52.6'S 148°26.5'E, 140 m, fine sand, epibenthic sled, 15 November 1981, R. Wilson, RV Tangaroa , stn BSS-170S; 1 ovigerous female, AM P.70317, Yatala Harbour , Spencer Gulf , South Australia, 32°45'S 137°55'E, 4.5–6 m, 8 March 1938, K. Sheard on F.L. Whyalla ; 1 male, 1.9 mm, AM P.86503 and 5 males, SAMA C7034 , The Pages , South Australia, approx. 35°46’S 138°18’E, 16.5 m, submarine light, 12 April 1941, K. Sheard ; 2 specimens, MV J62540 , Pearson Island , South Australia, 33°57.3’S 134°15.7’E, 20 m, tufted algae and trapped sand on exposed rock, 17 April 1985, G.C.B. Poore, FV Lemnos, stn MV SA-54 .

Additional material examined. 1 specimen, AM P.77494, north-east side of Little Broughton Island, northeast of Port Stephens, New South Wales, 32°37'5"S 152°20'6"E, 17 m, Ecklonia holdfasts from rock reef with gutters and sand patches, 11 March 2006, R. T. Springthorpe , stn NSW-2940 ; 14 specimens (female and male), AM P.77896, Burrill Rocks, Ulladulla , New South Wales, 35°23.39'S 150°28.24'E, 22 m, red alga, 7 May 1997, A. Murray, stn NSW-1356 ; 1 specimen, AM P.70318, 2 km south-east of South Point, Two Peoples Bay , Western Australia, 34°58'S 118°12'E, 6–10 m, Caulerpa on rock shelf, 16 December 1983, J.K. Lowry, stn WA-175 ; 1 specimen, AM P.70319, same locality, 6–10 m, alga with ascidian(?) on back of fronds, 16 December 1983, J.K. Lowry, stn WA- 177 ; 2 specimens, AM P.70320, same locality, 12 m, filamentous bryozoan, 16 December 1983, R. T. Springthorpe , stn WA-182 ; 1 specimen, AM P.70321, Cathedral Rock, Rottnest Island , Western Australia, 32°01.5S 115°27'E, 3 m, under limestone rock overhangs, coralline algae plus bits of red algae and sponge, 21 December 1983, J.K. Lowry, stn WA-248 .

Type locality. 20 km east-north-east of Bold Head , King Island, Central Bass Strait, Australia, 40°0.0’S 144°20.9’E to 40°0.0’S 144°23.6’E, 46–48 m depth.

Etymology. The species is named for Yatala Harbour, one of the localities in which type material was collected.

Diagnosis. Antenna 1 peduncular article 1 without distal projection. Gnathopod 1dactylus reduced, offset. Uropod 1 uniramous.

Description. Head concealed by pereonite 1 and coxa 1. Body with dense cover of tiny setae; pereon unpro-

duced, pleon with dorsal projections, pleonites 2 and 3 with rounded dorsal projections, urosomite 1 with strong apically acute projection. Antenna 1 peduncular article 1 without distal projection; accessory flagellum absent. Mandible accessory setal row absent; molar a setose lobe. Maxilla 1 palp long, 1-articulate. Maxilliped inner plate styliform; outer plate subovate, distomedial margin smooth, forming a hardened, incisor-like cutting edge, with coarse irregular ridges on distolateral surface; palp 4-articulate.

Coxa 1 tapered ventrally. Gnathopod 1 carpus longer than propodus, subrectangular, anterior margin not produced anterodistally; dactylus reduced, offset. Gnathopod 2 dactylus absent, anterior and posterior projections of distal margin of propodus forming a scoop. Pereopod 7 basis, posteroventral corner subacute.

Urosomite 1 with large, apically acute dorsodistal projection. Uropod 1 uniramous. Uropod 2 uniramous. Uropod 3 without rami. Telson laminar, entire.

Remarks. The holotype, an ovigerous female, has no oostegites.

Distribution. Southern Australia, 3–140 m depth.

Figures

FIGURE 5. Ocosingo yatala sp. nov. Holotype, ovigerous female, 2.5 mm, MV J62538, central Bass Strait. Paratype, male, 1.9 mm, AM P.86503, The Pages, South Australia.

FIGURE 6. Ocosingo yatala sp. nov. Holotype, ovigerous female, 2.5 mm, MV J62538, central Bass Strait. Scales represent 0.1 mm.

FIGURE 7. Ocosingo yatala sp. nov. Holotype, ovigerous female, 2.5 mm, MV J62538, central Bass Strait. Scales for U1–3, T represent 0.05 mm; remainder represent 0.1 mm.