Australian Amphipoda: Aoridae

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

Aora typica Kroyer, 1845

Aora typica Kroyer, 1845: 238, pl. 3, fig. 3. --Chilton, 1885: 370 (form l).--Della Vale, 1893: 409, pl. 56, figs. 38�40. --Chilton, 1909: 645. --Stephensen, 1949: 41, fig. 18 (form typica).--Ledoyer, 1967: 131, fig. 15. --Myers, 1973: 287, fig. 14.

Lalaria longitarsus Nicolet, 1849: 243, pl. 2, fig. 8a-f.

Aora sp. J.L. Barnard, 1972: 124, fig. 10 i-j.

Type material. Unknown.

Type locality. Valpariso, Chile.

Description. Based on Myers & Moore, 1983:169, figs 2, 3, 4, 13 [Snares Islands, New Zealand].

Head. Rostrum absent or vestigial; Lateral cephalic lobes apically truncate or apically round, anteroventral margin shallowly excavate, scarcely recessed. Antenna 1 flagellum with 21 or more articles; accessory flagellum present and multiarticulate. Antenna 2 with few long setae. Labium with fine setae and stout setae. Maxilliped basis with strong flange on anterior margin; palp with wing-like flanges on anterior margin of basis, ischium and merus (basis and ischium?). Mandible, palp article 3 longer than 2, posterior margin straight or weakly falcate, mandible palp posterior margin with setae of two distinct lengths, long setae and an understory of much shorter regularly spaced setae.

Peraeon. Sternal spines absent. Gnathopod 1 enlarged in males only; coxa distinctly produced anterodistally, acute; basis robust, half or more as broad as long, with spine on anterior margin, anterior margin without stridulating ridges, posterodistal margin with setae sparse or absent, anterodistal margin with strong flange, with a weak distomedial lobe or absent; ischium anterior margin with rounded or acute flange, posterior margin with setae sparse or absent; merus not greatly elongated, fused along its entire length with carpus, posterior margin with sparse setae or setae absent, without posterodistal spine; carpus subequal in length with propodus, anterior margin without stridulating ridges, with setae sparse or absent, anterior surface with no spine, without an oblique row of long setae on medial face, posterior margin without spines; propodus shorter than carpus or subequal in length to carpus, anterior margin weakly to moderately setiferous, posterior margin straight or evenly convex, palm present, palm delimited from posterior margin, margin entire, palm defined by rounded or oblique corner or corner undefined, with robust seta defining palm, without spine near base of dactylus; dactylus more than half length of propodus, fitting palm. Gnathopod 2 subchelate; basis anterodistal margin without flange, posterodistal margin without robust setae; with few setae along length of basis; carpus subequal with or shorter than propodus, anterior margin not lobate, moderately to sparsely setiferous; propodus moderately to sparsely setose. Pereopod 6 basis not or weakly produced posterodistally. Pereopod 7 significantly less than 125% length of pereopod 6.

Pleon. Epimeron 3 posterodistal margin produced into a small spine. Uropod 1 biramous, rami rami subequal, peduncle much longer than broad, distoventral interramal spine shorter than peduncle. Uropod 2 peduncle with distoventral interramal spine. Uropod 3 biramous, outer ramus shorter than inner, inner ramus one and one half times length of peduncle.

Depth zones. Littoral.

Distribution. New South Wales: Port Jackson (Myers & Moore, 1983).

Geographic areas. South-eastern Australia.

Extrinsic distribution. Widely distributed in the southern hemisphere between 20�S and 50�S.

(Variant) Female (sexually dimorphic characters).

Head. Maxilliped palp with wing-like flanges on anterior margin of basis, ischium and merus.

Peraeon. Gnathopod 1 coxa unproduced anterodistally, or distinctly produced anterodistally, sub-acute; without a spine; ischium anterior margin without flange; carpus two thirds length of propodus; propodus longer than carpus.

Cite this publication as: 'J.K. Lowry, P.B. Berents & R.T. Springthorpe (2001 onwards). Australian Amphipoda: Aoridae. Version 1: 2 October 2000.'. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993, 1995, 2000) should also be cited (see References).