Australian Amphipoda: Aoridae

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

Bemlos trudis Myers, 1988

Bemlos trudis Myers, 1988b: 286, figs 17-19.

Type material. HOLOTYPE: male, 5.0 mm, AM P37422. PARATYPES: 1 male, AM P37423; 1 female, AM P38609; 1 female, AM P38610.

Type locality. Near Moona Moona Creek, Jervis Bay, New South Wales, with ascidians.

Description. Based on Myers, 1988: 286, figs 17-19 [Jervis Bay].

Head. Rostrum absent or vestigial; Lateral cephalic lobes apically truncate or apically round, anteroventral margin moderately excavate, moderately recessed. Antenna 1 flagellum with 20 or less articles; accessory flagellum present and multiarticulate. Labium with fine setae and stout setae. Maxilla 1 inner plate with 1 long pectinate apical seta. Maxilliped basis without strong flange on anterior margin. Mandible, palp article 3 longer than 2, posterior margin straight or weakly falcate or widest medially, mandible palp posterior margin setae of more than two distinct lengths.

Peraeon. Sternal spines present, on other pereonites, apically acute. Gnathopod 1 enlarged in males only; coxa unproduced anterodistally, or distinctly produced anterodistally, sub-acute; 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 strong flange, 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 one third length of 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 longer than carpus, anterior margin weakly to moderately setiferous, posterior margin straight or evenly convex, palm present, palm delimited from posterior margin, margin forming a narrow sinus, palm defined by strong posterodistal spine, with robust seta defining palm, with spine near base of dactylus, with subquadrate spine; dactylus about half length of propodus, significantly overlapping palm or fitting palm. Gnathopod 2 subchelate; basis anterodistal margin with 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, palm with robust seta(e) defining palm.

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 biramous, rami subequal, inner ramus one and one half times length of peduncle.

Habitat. Among ascidians and sponges.

Depth zones. Littoral (3 to 6 m depth).

Distribution. New South Wales: Jervis Bay (Myers, 1988b); South Australia: Kangaroo Island (Myers, 1988b).

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


(Variant) Female (sexually dimorphic characters).

Head. Mandible, palp article 3 posterior margin widest medially.

Peraeon. Sternal spines absent. Gnathopod 1 coxa unproduced anterodistally, or distinctly produced anterodistally, rounded; carpus two thirds length of propodus or subequal in length with propodus; propodus subequal in length to carpus or longer than carpus, margin entire, palm defined by rounded or oblique corner; significantly overlapping palm. Gnathopod 2 basis anterodistal margin without flange.


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

Index