Australian Amphipoda: Aoridae

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

Grandidierella japonica Stephensen, 1938

Grandidierella japonica Stephensen, 1938: 179, figs 1�2. --Myers, 1981b: 218, fig. 4.

Type material. SYNTYPES: whereabouts unknown.

Type locality. Abasiri River, Hokkaido, Japan, brackish, on bottom.

Description. Based on Myers, 1981b: 218, fig. 4 [Hawkesbury River].

Head. Rostrum absent or vestigial; Lateral cephalic lobes apically round or apically sub-acute, anteroventral margin moderately excavate, scarcely recessed. Antenna 1 flagellum with 20 or less articles; accessory flagellum absent or vestigial. Antenna 2 with profuse long setae. Mandible, palp article 3 subequal to 2, posterior margin widest medially, mandible palp posterior margin setae of more than two distinct lengths.

Peraeon. Sternal spines present, on pereonite 1 only, apically acute. Gnathopod 1 enlarged in males only; coxa unproduced anterodistally, or distinctly produced anterodistally, rounded; basis robust, half or more as broad as long, without a spine, anterior margin without stridulating ridges, posterodistal margin with setae sparse or absent, anterodistal margin with flange weak or absent, with a weak distomedial lobe or absent; ischium anterior margin without 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 twice length of propodus, anterior margin with stridulating ridges, with setae sparse or absent, anterior surface with no spine, without an oblique row of long setae on medial face, posterior margin with stout spine or spines, one spine or two spines, proximal the larger; propodus shorter than carpus, anterior margin weakly to moderately setiferous, posterior margin sinuous or irregular with proximal lobe, palm absent; dactylus more than half length of propodus. Gnathopod 2 subchelate; basis anterodistal margin without flange, posterodistal margin without robust setae; with few setae along length of basis; carpus longer than propodus, anterior margin not lobate, moderately to sparsely setiferous; propodus moderately to sparsely setose, palm with robust seta(e) defining palm. Pereopod 6 basis not or weakly produced posterodistally. Pereopod 7 significantly less than 125% length of pereopod 6.

Pleon. Epimeron 3 posterodistal margin rounded. 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 uniramous, inner ramus one and one half times length of peduncle.

Depth zones. Littoral.

Distribution. New South Wales: Hawkesbury River (Myers, 1981b; Jones, et al., 1986; Jones, 1987).

Geographic areas. South-eastern Australia.

Extrinsic distribution. Widely distributed in the Pacific.

(Variant) Female (sexually dimorphic characters).

Peraeon. Sternal spines absent (?). Gnathopod 1 basis slender, much less than half as broad as long; carpus subequal in length with propodus, anterior margin without stridulating ridges, posterior margin without spines; propodus subequal in length to carpus, palm present, palm delimited from posterior margin, margin entire, palm defined by rounded or oblique corner, with robust seta defining palm; significantly overlapping palm. Gnathopod 2 carpus subequal with or shorter than propodus.

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).