Parvamussium marmoratum

(Dall, 1881)




Original name   Amussium lucidum var. marmoratum Dall, 1881
Autoreference   Dall, 1881: 117.
Reference   Dall, W.H., 1881. Reports on the results of dredging under the supervision of Alexander Agassiz, in the Gulf of Mexico and in the Caribbean Sea, 1877-79, by the U.S. Coast Survey Steamer "Blake", [...]. XV. Preliminary report on the Mollusca. Part I. - Bulletin of the Museum of Comparative Zoology 9(2): 33-144.
Type data

  Syntypes in the Smithsonian Institution, National Museum of Natural History, Washington DC (USNM), and Museum of Comparative Zoology, Harvard University, Cambridge, USA (MCZ). Type locality (not specified): "Blake" stn 2 (805 fms), stn 21 (287 fms), Yucatan Strait (640 fms), stn 5 (229 fms), stn 35 (804 fms), stn 3 (243 fms), stn 19 (310 fms), stn 47 (331 fms), off Havana (119, 127, 243, 450, 480 fms), off Morro Light (292 fms), stn 7 (off San Antonio, 424 fms), stn 44 (539 fms), Gulf of Mexico, W of Florida (30 fms), Charlotte Harbor, Florida (13 fms).


  Shell up to ca. 14 mm high, fragile, weakly inflated, left valve slightly more convex than right valve, circular, somewhat oblique posteriorly, inequivalve, inequilateral, anterior auricles larger than posterior, unequal in shape, internal ribs usually 10, extending to marginal apron, umbonal angle ca. 90 degrees, mottled with scarlet, opaque white, and orange, translucent.

  Left valve smooth and glossy with very weak lamellar growth lines marginally. Anterior auricle with delicate commarginal lamellae near disc, posterior smooth.

  Right valve with numerous regularly spaced, delicate commarginal lirae. Byssal notch shallow, byssal fasciole narrow.



Florida, Gulf of Mexico, West Indies, NE Brazil

Habitat  Living sublittorally and bathyally on soft bottom assemblages.