North-eastern Atlantic Amphipoda: Aoridae

R. King & A.A. Myers

Unciola planipes Norman, 1867

Unciola planipes Norman, 1867: 14; Sars, 1894: 621, pl. 223. --Stebbing, 1906: 679. --Chevreux & Fage, 1925: 356. --Schellenberg, 1942: 215. --Lincoln, 1979: 538, fig. 257.

Unciola leucopes Bate and Westwood, 1868: 518.

Type material. Unknown.

Type locality. Unknown.

Description. Based on Lincoln, 1979: 538, fig. 257; Barnard and Karaman, 1991: 237�238.

Head. Rostrum present, well developed; Lateral cephalic lobes apically acute, anteroventral margin moderately excavate, moderately recessed. Antenna 1 flagellum with 20 or less articles; accessory flagellum present and with one long and one rudimentary article. Antenna 2 with few long setae. Labium with fine setae and stout setae. Maxilla 1 inner plate with more than one seta. Maxilliped basis without strong flange on anterior margin. Mandible, palp article 3 shorter than 2, posterior margin straight or weakly falcate.

Peraeon. Sternal spines present, on pereonite 1 only, apically acute. Gnathopod 1 enlarged in both sexes (?); coxa distinctly produced anterodistally, 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 two thirds length of propodus, anterior margin without stridulating ridges, with long dense setae, 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 broad excavate sinus, palm defined by subquadrate corner or defined by rounded or oblique corner, without robust seta defining palm, without spine near base of dactylus; dactylus about half length of propodus, fitting palm. Gnathopod 2 simple; 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, densely setose; propodus densely 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 strong spine below a deep sinus. Uropod 1 biramous, rami inner ramus distinctly longer than outer, peduncle much longer than broad, distoventral interramal spine shorter than peduncle. Uropod 2 peduncle with distoventral interramal spine. Uropod 3 uniramous, inner ramus subequal with length of peduncle. Telson with distal fine setae only.

Habitat. Unknown.

Depth zones. Littoral, or Continental shelf, or Continental slope.

Remarks. Found from 10 to 600 metres (Lincoln, 1979).

Distribution. Arctic Ocean, North Atlantic; Greenland, Iceland, European coasts from northern Norway to Bay of Biscay (Lincoln, 1979).

(Variant) Female (sexually dimorphic characters).

Peraeon. Sternal spines absent. Gnathopod 1 with setae sparse or absent; anterior-distal margin densely clothed in long setae, margin entire, palm defined by rounded or oblique corner; dactylus more than half length of propodus.

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).