Australian Amphipoda: Eusiridae

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

Eusiroides monoculoides (Haswell)

Atylus monoculoides Haswell, 1879: 327, pl. 18, fig. 4.

Eusiroides monoculoides. -Stebbing, 1906: 345 (in part). -Stebbing, 1910: 595.

? Bovallia monoculoides. -Chilton, 1921b: 66.

not Euriroides monoculoides. -Chevreux, 1908: 478 (Gambier, Tuomotu Archipelago). -K.H. Barnard, 1916: 174 (South Africa). -Schellenberg, 1931: 173, fig. 90 (Strait of Magellan). -Stephensen, 1949: 15 (Tristan da Cunha).

not Bovallia monoculoides. -Chilton, 1909: 622 (Someplace). -Chilton, 1912: 494(Someplace). -Chilton, 1924: 270(Someplace). -Chilton, 1925: 177 (= Bovallia gigantea Pfeffer, 1888). -Stephensen, 1927: 316 (Auckland Islands).

Type material. Possible SYNTYPE: 1 specimen, AM P3445.

Type locality. Clark Island, Port Jackson, New South Wales (33º 51'S 151º 16'E), living at the low water mark among algae and polyzoans.

Description. Head rostrum present, short; eyes present, eyes reniform. Body dorsally smooth. Antenna 1 longer than antenna 2 (slightly); accessory flagellum present, accessory flagellum longer than broad (1-articulate). Mandible molar columnar, triturative. Lower lip inner lobes present; outer lobes with narrow gap. Maxilla 1 inner plate apically setose. Maxilla 2 inner plate much broader than outer; inner plate slender medial setae few or absent, without oblique row of slender setae.

Peraeon. Gnathopod 1 subchelate; subequal to gnathopod 2; coxa strongly produced anteroventrally; carpus not cantilevered, shorter than propodus, posterodistally lobed; propodus without robust setae along posterior margin (adults); dactylus narrowing distally, apically acute or subacute. Gnathopod 2 not sexually dimorphic. Gnathopod 2 subchelate; carpus not cantilevered, posterodistally 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 serrate, corner subacute. 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 at the low intertidal among algae and polyzoans and on soft bottoms down to 100 m.

Depth zones. Littoral, or Continental shelf.

Remarks. Apparently E. monoculoides has not been redescribed since its original description. At the moment E. caesaris (Bass Strait) and E. monoculoides (Port Jackson) are in synonymy and until they can be absolutely separated we have a problem! The current description of E. monoculoides in this account is apparently based on E. pompeii Stebbing, 1888 from Heard Island!.

Distribution. New South Wales: Mary's Rock, Cook Island (AM); Julian Rocks (AM); Coffs Harbour (AM); Port Stephens (AM); Clark Island, Port Jackson (Haswell, 1879); Long Bay (AM); Wattamolla (AM); Norah Head (AM);. Victoria: Crib Point, Western Port (AM). South Australia: west of Kingston (Chilton, 1921b).

Geographic areas. South-eastern Australia, or Southern Australia.

Extrinsic distribution. ? New Zealand.

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'.