PROPEAMUSSIIDAE  

Parvamussium cassium

Dijkstra, 1991

Figure(s)

     

  

Holotype

Original name   Parvamussium cassium Dijkstra, 1991
Autoreference   Dijkstra, 1991: 11, figs 22-27.
Reference   Dijkstra, H.H., 1991. A contribution to the knowledge of the pectinacean Mollusca (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from the Indonesian Archipelago. - Zoologische Verhandelingen 271: 1-57, figs 1-91. Leiden.
Type data

  Holotype (pr: H 9.9 mm, L 10.5 mm, D 2.1 mm) Naturalis - National Museum of Natural History, Leiden (RMNH 56549). Type locality: Indonesia, Flores Sea, NE Taka Bone Rate (Tiger Island), E of Tarupa Kecil, 06*29.7'S, 121*10.8'E, 450-600 m, alive, calcareous mud, 26.09.1984 (SNELLIUS-II stn 4.142).

Description

  Shell up to ca. 10 mm high, fragile, semi-transparent, weakly inflated, subcircular, somewhat wider than high, left valve slightly more convex than right valve, inequivalve, nearly equilateral, anterior auricles larger than posterior, unequal in shape, only one rudimentary internal riblet on posterior auricle, umbonal angle ca. 105 degrees, colour milky white.

  Left valve with a delicate reticulate sculpture and secondary intercalated radial riblets. Intersections with fine spines. Auricles of similar sculpture.

  Right valve with closely spaced commarginal lirae and minute radial sculpture. Byssal notch shallow, byssal fasciole narrow and ctenolium lacking.

Distribution

 

Indonesia, Flores Sea (TL), Banda Sea, Arafura Sea, Wallis and Futuna Islands

Habitat Living bathyally on soft bottom assemblages.