Australian Amphipoda: Melitae

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

Ceradocus (Denticeradocus) oxyodus Berents, 1983

Ceradocus rubromaculatus. --K.H. Barnard, 1931: 124.

Ceradocus (Denticeradocus) oxyodus Berents, 1983: 104, figs 3-4.

Type material. HOLOTYPE: male, 8.9 mm, AM P31716. PARATYPES: 3 specimens, AM P31717.

Type locality. Casuarina Beach, Lizard Island, Great Barrier Reef (14º 40.5'S 145º 26.6'E), under stones at low tide.

Description. Based on Berents, 1983: 104, figs 3-4. Head with anteroventral notch or slit. Antenna 1 longer than antenna 2; peduncular article 1 not geniculate with article 2, shorter than article 2, with 3 robust setae along posterior margin; flagellum with 21 articles; accessory flagellum with 6 articles. Antenna 2 peduncular article 2 cone gland not reaching to end of peduncular article 3; flagellum with 12 articles. Mandible palp present, well developed, article 3 cone-like, setose on distomedial margin, longer than article 1, article 2 longer than article 3, article 1 produced distally, shorter than article 2. Maxilla 1 inner plate setose along entire inner margin.

Pereon. Gnathopod 1 not sexually dimorphic; coxa anteroventral corner produced, acute, coxa posteroventral corner notch absent; merus without posterodistal tooth; carpus about 2 x as long as broad; propodus without anterodistal projection, posterodistal margin not swollen, palm acute, straight, without posterodistal corner, defined by posterodistal robust setae. Gnathopod 2 subchelate; left and right gnathopods subequal in size; merus with sharp posteroventral tooth; without strong concentration of setae, palm acute, straight, smooth, lined with robust setae, defined by posteroventral tooth; dactylus closing along palm, reaching end of palm. Peraeopod 6 coxa anterior lobe ventral margin not produced ventrally. Peraeopod 6 basis posterior margin straight. Peraeopod 6 basis posteroventral corner with acute or subacute process. Peraeopod 6 propodus not expanded posterodistally. Peraeopod 7 basis posterior margin straight, or convex (slightly). Peraeopod 7 basis with posterior margin smooth or minutely castelloserrate, posteroventral corner with acute or subacute process. Peraeopod 7 propodus not expanded posterodistally.

Pleon. Pleonite 1 with dorsal serrations, without dorsodistal spines, not dorsally bicarinate. Pleonite 2 with dorsal serrations, without dorsodistal spines, not dorsally bicarinate. Pleonite 3 with dorsal serrations, without dorsodistal spines, dorsally smooth. Epimeron 1 anteroventral corner without curved spine. Epimera 1-2 posteroventral margin with 4 large or small spines above spine defining posteroventral corner, or with 5 or more large or small or groups of spines above spine defining posteroventral corner. Epimeron 3 posterior margin serrate, posteroventral corner with small acute spine, posteroventral margin smooth or serrate. Urosomite 1 without dorsal carina, without a small dorsal hump, with dorsal serrations, with spines at midline, no conspicuous medial gape, not dorsally bicarinate. Urosomite 1 without posterodorsal spine. Urosomite 2 posterior margin smooth, without dorsolateral robust setae. Urosomite 3 without dorsal robust setae. Uropod 1 peduncle without distoventral spur. Uropod 3 exceeding uropods 1 and 2; inner ramus subequal in length to outer ramus. Telson cleft. Telson without robust setae on inner margins. Telson each lobe with 2 apical/subapical robust setae, apical conical extension reaching at least halfway along longest seta.

Habitat. Marine; under stones at low tide mark.

Depth zone. Littoral.

Remarks. The female is not known.

Distribution. Queensland: Low Isles, Lizard Island, Great Barrier Reef (Berents, 1983).

Australian geographic areas. North-eastern Australia.

Cite this publication as: 'J.K. Lowry, P.B Berents & R.T. Springthorpe (2000 onwards). Australian Amphipoda: Melitae Descriptions, Illustrations, Identification and Information Retrieval. Version: 2 October 2000. https://crustacea.net'.