North-eastern Atlantic Amphipoda: Aoridae

R. King & A.A. Myers

Microdeutopus gryllotalpa Costa, 1853

Microdeutopus gryllotalpa Costa, 1853: 178. --Chevreux & Fage, 1925: 299, fig. 310. --Myers, 1982a: 148-149, fig. 98.

Autonoe grandimana Bruzelius, 1859: 26, pl. 1. fig. 5.

Microdeutopus minax Smith, 1874: 562.

Microdeutopus bidens Sowinsky, 1880: 129, pl. 5 fig. 18.

Microdeuteropus gryllotalpa (Costa). --Norman, 1886: 16.

Microdeuteropus minax (Smith). --Norman, 1886: 17.

Type material. Unknown.

Type locality. Lago del Fusaro, Napoli (Naples), Italy.

Description. Based on Myers, 1982a: 148-149, fig. 98.

Head. Rostrum absent or vestigial; Lateral cephalic lobes apically truncate, anteroventral margin moderately excavate, scarcely recessed. Antenna 1 flagellum with 21 or more articles; accessory flagellum present and with one long and one rudimentary article. Antenna 2 with few long setae. Maxilliped basis without strong flange on anterior margin.

Peraeon. Sternal spines present, on other pereonites, apically rounded. Gnathopod 1 enlarged in males only; coxa distinctly produced anterodistally, acute; basis slender, much less than half 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 twice 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 with stout spine or spines, three or more spines, distal 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 with flange, posterodistal margin without robust setae; with few setae along length of basis; carpus longer than propodus, anterior margin not lobate, densely setose; propodus densely setose. Pereopod 6 basis not or weakly produced posterodistally.

Pleon. Epimeron 3 posterodistal margin with a small notch. 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 subequal with length of peduncle. Telson with distal fine setae only.

Habitat. In lagoons, salt marshes, among algae, shells, polzoans, tunicates etc.:high detritus accumulation.

Depth zones. Littoral.

Distribution. Black Sea, Atlantic Ocean, Mediterranean Sea.

(Variant) Female (sexually dimorphic characters).

Peraeon. Sternal spines absent. Gnathopod 1 coxa distinctly produced anterodistally, sub-acute; posterior margin with dense rows of setae; carpus subequal in length with propodus, 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 or corner undefined, with robust seta defining palm; significantly overlapping palm. Gnathopod 2 basis anterodistal margin without flange; carpus subequal with or shorter than propodus; palm with robust seta(e) defining palm.

Cite this publication as: 'King, R. & A.A. Myers (2001 onwards). North-eastern Atlantic Amphipoda: Aoridae. Version 1: 1 September 2001.'. Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993, 1995, 2000) should also be cited (see References).