Catillopecten translucens (Dautzenberg & Bavay, 1912)

Dijkstra, Henk H. & Maestrati, Philippe, 2008, New species and new records of deep-water Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae and Pectinidae) from the South Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 77-114 : 99-100

Catillopecten translucens (Dautzenberg & Bavay, 1912)

Figs 34, 35

Pecten (Cyclopecten) translucens Dautzenberg & Bavay, 1912: 30 , pl. 27, figs 5-6.

TYPE MATERIAL. — Holotype (live) ZMA Moll. 3.12.008.

FIGS 32-41. 32-33, Cyclopecten bavayi Dijkstra, 1990 , SALOMON 1 stn CP 1781; 32, left valve exterior H 54 mm, L 6.2 mm; 33, right valve, exterior H 4.8, L 5 mm. 34-35, Catillopecten translucens (Dautzenberg & Bavay, 1912) , MUSORSTOM 9 stn CP 1290; 34, left valve, exterior, H 6.5 mm, L 6.0 mm; 35, right valve, exterior, H 6.5 mm, L 6.0 mm. 36-41, S imilipecten herosae n. sp., holotype MNHN 20461, H 3.8 mm, L 4.1 mm, BORDAU 2 stn DW 1581; 36, left valve, exterior; 37, right valve, exterior; 38, left valve, interior; 39, right valve, interior; 40, left valve, microstructure, scale bar 400 Μm; 41, right valve, microstructure, scale bar 400 Μm.

TYPE LOCALITY. — Indonesia, Makassar Strait , 0˚34.6’N, 119˚8.5’E, 1301 m, alive, yellow mud [ Siboga stn 88] .

MATERIAL EXAMINED. — The type material. Marquesas. MUSORSTOM 9: stn CP 1290, 8˚53’S, 139˚38’W, 341-344 m, 1 spm (Figs 34, 35) .

DISTRIBUTION. — Indonesia; live in 1301 m. New record for the Marquesas Islands . Present specimen live in 341- 344 m.

DESCRIPTION. — Shell small, up to c. 10 mm in height, fragile, semi-transparent, flattened, circular, inequivalve, nearly equilateral, left valve slightly inflated, right valve flat, posterior auricle somewhat curved below disc, demarcated by a fold and slightly larger than anterior, umbonal angle c. 110˚, colour whitish semi-transparent.

Left valve completely smooth and dull, without commarginal undulations, lacking macro- and microsculpture.

Right valve slightly more opaque than left valve, up to 1 mm high, glossy. Anterior auricle with delicate commarginal lirae, posterior smooth and continuous with disc. Hinge line straight. Internal ribs absent. Byssal notch relatively deep, byssal fasciole and ctenolium lacking.

REMARKS. — The present specimen from the Marquesas is similar to the type specimen from Indonesia, but differs in size (height 6 mm, typical 10 mm) and sculpture of the right valve, which has delicate commarginal lirae in the early growth stage (smooth in the type) and commarginal lirae on the anterior auricle of the right valve (smooth in the type). Other morphological characters are very similar .