Propeamussium sewelli

(Knudsen, 1967)




Figured holotype

Original name   Amussium sewelli Knudsen, 1967
Autoreference   Knudsen, 1967: 279, pl. 2, figs 1-2, textfigs 18A-B.
Reference   Knudsen, J. 1967. The deep-sea Bivalvia. The John Murray Expedition 1933-34, Scientific Reports 11 (3): 237-343, pls 1-3.
Type data   Holotype (pr: H 36 mm, L 34 mm) The Natural History Museum, London (BMNH 196641). Type locality: Zanzibar area, 04*05'54"S, 41*10'12"E, 1789 m, alive, globigerina ooze, 17.i.1934 ("John Murray" stn 118).

  Shell up to ca. 20 mm high, fragile, semi-transparent, weakly inflated, nearly circular to ovate, left valve slightly more convex than right valve, slightly equivalve and equilateral, auricles relatively small and nearly equal in size, with a transverse sculpture, colour usually whitish.

  Left valve with regularly spaced delicate commarginal lirae, central part of disc also with minute radial sculpture, obsolete near ventral margin.

  Right valve only with regularly spaced commarginal lirae. Internal ribs generally 11. Byssal notch and ctenolium lacking.



Zanzibar area (TL)

Habitat  Living lower bathyally on soft bottom assemblages.