Scolopostoma darwinensis, 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 : 56-57

Scolopostoma darwinensis sp. nov.

( Figs 8–10 )

Scolopostoma prionoplax . — Lowry & Stoddart, 1983: 285 (in part, material cited from Port Darwin). —Lowry & Stoddart, 1986: 744. — Lowry & Stoddart, 2003: 170 (Australian record).

Type material. Holotype, female, 4.5 mm, ovigerous (14 eggs), AM P.33816, East Point , Darwin, Northern Territory, Australia, approx. 12°27'S 130°50'E, intertidal, on encrusting ascidian Didemnum psammatodes, J.R. Hanley , 31 August 1981, stn NT-106 . PARATYPES: 2 females, AM P.69098, same data as Holotype ; 27 specimens, AM P.69099, west of East Point , Fannie Bay, Darwin, Northern Territory, Australia, 11°24.5’S 130°48.5’E, 8–10 m, didenopsid tunicate, 26 October 1982, J.K. Lowry, stn NT-97 ; 13 specimens, AM P.69100, Goat Point , Darwin, Northern Territory, Australia, approx. 12°28'S 130°49'E, 6–7 m, from ascidian Didemnum psammatodes , on rock, J. Hooper, 22 December 1982, stn GP 12 [ AM stn NT-107] ; 1 male, 3.0 mm, AM P.69101, East Point , Darwin, Northern Territory, Australia, approx. 12°27'S 130°50'E, stn EP/9(6) [ AM stn NT-108] ; 1 male, AM P.69102, Shell Island , Darwin Harbour, Northern Territory, Australia, 12°29.7'S 139°52.7'E, 7 m, encrusting ascidian, Didemnum psammatodes, P. Horner , 3 August 1983, stn SI 1 [ AM stn NT-110] ; 8 specimens, AM P.69103, Old Man Rock , Darwin Harbour, Northern Territory, Australia, approx. 12º29'S 130º54'E, 2 m, dead sponge, 9 July 1993, G. Edgar .

Type locality. East Point , Darwin, Northern Territory, Australia, approx. 12°27'S 130°50'E .

Etymology. The species is named for its type locality.

Diagnosis. Gnathopod 1 carpus subtriangular. Uropod 3 without rami. Telson entire.

Description. Head exposed. Body with many scattered setae; pereon and pleon without dorsal projections. Antenna 1 peduncular article 1 without distal projection; accessory flagellum 2-articulate. Mandible accessory setal row with 3 robust setae; molar absent. Maxilla 1 palp short, 1-articulate. Maxilliped inner plate subrectangular; outer plate subovate, distomedial margin serrate, without distolateral sculpturing; palp 4-articulate.

Coxa 1 subquadrate ventrally. Gnathopod 1 carpus shorter than propodus, subtriangular, anterior margin produced anterodistally; dactylus regular simple. Gnathopod 2 dactylus inserted near anterodistal corner of propodus. Pereopod 7 basis, posteroventral corner rounded.

Urosomite 1 with irregular subquadrate boss. Uropod 1 biramous; rami subequal in length. Uropod 2 biramous; rami subequal in length. Uropod 3 without rami. Telson hemiacetabulate, entire.

Remarks. Ovigerous females have no oostegites.

Distribution. Darwin Harbour, northern Australia; intertidal to 10 m depth.

Figures

FIGURE 8. Scolopostoma darwinensis sp. nov. Holotype, ovigerous female, 4.5 mm, AM P.33816, East Point, Darwin, Northern Territory.

FIGURE 9. Scolopostoma darwinensis sp. nov. Holotype, ovigerous female, 4.5 mm, AM P.33816 and paratype male, 3.0 mm, AM P.69101, East Point, Darwin, Northern Territory. Scales represent 0.1 mm.

FIGURE 10. Scolopostoma darwinensis sp. nov. Holotype, ovigerous female, 4.5 mm, AM P.33816, East Point, Darwin, Northern Territory. Scales for U1–3, T represent 0.1 mm; remainder represent 0.2 mm.