PECTINIDAE

Delectopecten alcocki

(Smith, 1904)

Figures

 

lv                    Lectotype                     rv

Original name   Pecten alcocki Smith, 1904
Autoreference   Smith, 1904: 13.
Reference   Smith, E.A., 1904. Natural history notes from H.M. Indian Marine Survey Steamer "Investigator", Ser. 3 (1). On Mollusca from the Bay of Bengal and the Arabian Sea. - Annals and Magazine of Natural History, ser. 7, 14: 1-14.
Type data   Lectotype (pr: H 19 mm, L 18 mm, D 7 mm) Zoological Survey of India, New Alipore, Calcutta (ZSI M669/1), designated by Dijkstra (1995: 50). Type locality: Laccadive Sea, 07*17'30"N, 76*54'30"E, 786 m, alive, 19.x.1897 ("Investigator" stn 232).
Description

  Shell up to ca. 15 mm high, thin, circular, equiconvex, slightly equivalve and equilateral, auricles nearly equal in size, umbonal angle ca. 125 degrees, colour whitish, semi-transparent to opaque.

  Both valves with antimarginal striae and commarginal growth lines with radially aligned scales. Auricles similar sculptured and continuous with disc. Anterior auricles of right valve demarcated from disc with 2-4 radial ridges. Byssal notch relatively deep, byssal fasciole narrow, ctenolium well-developed with 3-5 teeth. Soft parts described by Knudsen (1967: 282).

Distribution

 

East Africa, Gulf of Aden, Laccadive Sea (TL), S Japan, Philippines, Indonesia, Coral Sea, New Caledonia

Habitat   Living bathyally, probably byssally attached to substrates on soft bottom assemblages.