Parvamussium gracilis

(Wang, 1984)




Original name   Propeamussium (Parvamussium) gracilis Wang, 1984
Autoreference   Wang, 1984: 601 [Chinese], 603 [English], pl. 1, figs 5-10.
Reference   Wang, Z., 1984. Studies on Chinese species of the family Pectinidae VI. Subfamily Propeamussiinae. - Oceanologia et Limnologia Sinica 15(6): 598-604, pl. 1, figs 1-14.
Type data

  Holotype (pr: H 7.4 mm, L 6.8 mm, D 1.6 mm) Institute of Oceanology, Academia Sinica, Qingdao (IOAS M25775). Type locality: South China Sea, 19*30'N, 113*00'E, 210 m, alive, sandy bottom, 05.iv.1960.


  Shell up to ca. 7.5 mm high, fragile, opaque, weakly inflated, left valve more convex than right valve, higher than wide, inequivalve, nearly equilateral, anterior auricles larger than posterior, unequal in shape, internal ribs 11-13, usually 12, umbonal angle ca. 95 degrees, colour whitish.

  Left valve with numerous, closely and irregularly spaced, delicate radial riblets and minute commarginal growth lines.

  Right valve with regularly spaced delicate commarginal lirae. Byssal notch shallow, byssal fasciole and ctenolium lacking.



South China Sea (TL)

Habitat  Living bathyally on sandy bottoms.