PROPEAMUSSIIDAE  

Propeamussium cancellatum

(Smith, 1885)

Figure(s)

       

Syntype

    lv - close up

 

Original name   Amussium cancellatum Smith, 1885
Autoreference   Smith, 1885: 315, pl. 23, figs 8-8c.
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   Figured syntype (pr: H 18 mm, L 16 mm, D 4.5 mm) The Natural History Museum, London (BMNH 1887.2.9.3326). Type locality: off St. Thomas [no further data]; off Culebra Island, 18*38'30"N, 65*05'30"W, pteropod ooze, 713 m, 25.03.1873 ("Challenger" stn 24); off Bermuda, 32*21'30"N, 64*35'55"W, 796 m, coral mud, 04.04.1873 ("Challenger" stn 33); off Bermuda, 32*08'45"N, 64*59'35"W, 1966 m, coral mud, 29.05.1873 (stn 56).
Description

  Shell up to ca. 20 mm high, fragile, transparent to opaque, weakly inflated, left valve slightly more convex than right valve, elongate, inequivalve, nearly equilateral, auricles unequal in size and shape, somewhat denticulate at dorsal margin, colour whitish or creamy.

  Left valve throughout with reticulate sculpture. Right valve with closely spaced commarginal lirae. Right valve with closely spaced commarginal lirae. Internal ribs generally 10-12, with interstitial rudimentary marginal riblets. Byssal notch and ctenolium lacking.

Distribution

 

Florida, Bermuda (TL), Culebra Island (TL), St. Thomas (TL), West Indies

Habitat  Living bathyally on soft muddy bottom assemblages.