Propeamussium caducum

(Smith, 1885)





NB. Marginal apron of right valve broken off.


Original name   Amussium caducum Smith, 1885
Autoreference   Smith, 1885: 309, pl. 23, figs 1-1c.
Reference   Smith, E.A., 1885. Report on the Lamellibranchiata collected by H.M.S. "Challenger" during the years 1873-1876. - Challenger Reports, Zoology, 13 (35): 1-341.
Type data   Lectotype (pr: H 20.9 mm, L 18.8 mm, D 4.5 mm) The Natural History Museum, London (BMNH 1887.2.9.3310), designated by Dijkstra (1995: 17). Type locality: Philippines, W of Luzon, 12*21'N, 122*15'E, 1280 m, alive, blue mud, 16.i.1875 ("Challenger" stn 207).

  Shell up to ca. 25 mm high, fragile, transparent to opaque, glossy, weakly inflated, left valve slightly more convex than right valve, elongate, inequivalve, nearly equilateral, auricles nearly equal with delicate commarginal striae, colour creamy.

  Left valve smooth with some growth lines, no radial striations. Right valve with closely spaced commarginal lirae. Right valve with commarginal lirae. Internal ribs generally 10, more rarely 9 or 11. Byssal notch and ctenolium lacking, lateral gape present.



Zanzibar, Gulf of Aden, Arabian Sea, Bay of Bengal, Japan, Philippines (TL), Indonesia, New Caledonia, Vanuatu

Habitat  Living bathyally on soft bottom assemblages.