Australian Amphipoda: Eusiridae

J.K. Lowry, P.B Berents & R.T. Springthorpe

Gondogeneia microdeuteropa (Haswell)

Atylus microdeuteropus Haswell, 1879: 102, pl. 2, fig. 3. --Haswell, 1882: 244.

Paramoera simplex. --Stebbing, 1906: 363 (in part). --Stebbing, 1910: 640 (in part).

Gondogeneia microdeuteropa. --J.L. Barnard, 1972a: 191, figs 115-117.

Type material. SYNTYPES (probable): 30 specimens AM P 3444.

Type locality. Port Jackson, New South Wales (33º 51'S 151º 16'E).

Description. Based on J.L. Barnard, 1972: 191, figs 115-117. Head rostrum present, short; eyes present, eyes subrectangular. Body dorsally smooth. Antenna 1 subequal in length to antenna 2, or shorter than antenna 2; accessory flagellum present, accessory flagellum scale-like. Mandible molar columnar, triturative. Lower lip inner lobes absent. Maxilla 1 inner plate apically setose. Maxilla 2 inner plate subequal or slightly broader than outer; inner plate with slender medial setae, with oblique row of slender setae or without oblique row of slender setae.

Peraeon. Gnathopod 1 subchelate; subequal to gnathopod 2, or larger than gnathopod 2; coxa weakly or not produced anteroventrally; carpus not cantilevered, shorter than propodus, weakly lobed; propodus with robust setae along posterior margin (adults); dactylus narrowing distally, apically acute or subacute. Gnathopod 2 not sexually dimorphic. Gnathopod 2 subchelate; carpus not cantilevered, weakly lobed, shorter than propodus; propodus without robust setae along posterior margin (adults); dactylus narrowing distally, apically acute or subacute. Peraeopods 3-4 propodus simple, with distal robust setae. Peraeopods 5-7 dactyli inner margins smooth or minutely castellate.

Pleon. Pleonites neither tricarinate. Epimeron 3 posteroventral margin smooth, corner broadly rounded. Uropod 1 outer ramus shorter than inner. Uropod 3 peduncle without dorsal robust setae; rami subequal in length. Telson cleft, without large apical robust setae.

Habitat. Marine; living among algae.

Depth zones. Littoral (intertidal).

Remarks. This species was unidentifiable until J.L. Barnard (1972) established Gondogeneia and made A. microdeuterpus the type species. According to Schreider (1998) Gondogeneia microdeuteropa is one of the three most abundant amphipods living on Sargassum on the outer coast in the Sydney area.

Distribution. New South Wales: Clark Island, Port Jackson (Haswell, 1879); Merimbula (J.L. Baranrd, 1972a); Munganno Point, Twofold Bay (Hutchings, et al., 1989); Cape Banks, Botany Bay (AM).

Geographic areas. South-eastern Australia.

Cite this publication as: 'J.K. Lowry, P.B Berents & R.T. Springthorpe (2000 onwards). Australian Amphipoda: Eusiridae. Version: 2 October 2000.'.