Australian Amphipoda: Eusiridae

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

Tethygeneia nalgo J.L. Barnard

Tethygeneia nalgo J.L. Barnard, 1972a: 205, fig. 122. --Hutchings, et al., 1989: 361.

Type material. HOLOTYPE: male, 6.1 mm, WAM 171-70.

Type locality. Middleton Beach, Albany, Western Australia, intertidal sandy rocks, coralline algae.

Description. Based on J.L. Barnard, 1972a: 205, fig. 122. Head rostrum present, long; eyes present, eyes reniform. Body dorsally smooth. Antenna 1 subequal in length to antenna 2, or shorter than antenna 2; accessory flagellum present or absent, 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, without oblique row of slender setae.

Peraeon. Gnathopod 1 subchelate; subequal to gnathopod 2; coxa weakly or not produced anteroventrally; carpus not cantilevered, shorter than propodus, without a lobe; dactylus narrowing distally, apically acute or subacute. Gnathopod 2 not sexually dimorphic. Gnathopod 2 subchelate; carpus not cantilevered, posterodistally lobed, shorter than propodus; dactylus narrowing distally, apically acute or subacute. Peraeopods 3-4 propodus simple, with distal slender setae. Peraeopods 5-7 dactyli inner margins minutely serrate.

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

Habitat. Marine; sandy rocks, coralline algae.

Depth zones. Littoral (intertidal).

Remarks. Tethygeneia nalgo is very similar to T. elanora. It differs mainly in the serrate dactyli of peraeopods 5 to 7.

Distribution. New South Wales: Merimbula (AM); Murrumbulga Point, Twofold Bay (Hutchings, et al, 1989). Western Australia: Albany (J.L. Barnard, 1972a).

Geographic areas. South-western Australia.

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