PROPEAMUSSIIDAE  

Parvamussium undosum

Dijkstra, 1991

Figure(s)

     

   

Holotype (lv)                                  Paratype (rv)

 

Original name   Parvamussium undosum Dijkstra, 1991
Autoreference   Dijkstra, 1991: 18, figs 53-61.
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 (lv: H 8.2 mm, L 8.4 mm) Naturalis - National Museum of Natural History, Leiden (RMNH 56550). Type locality: Indonesia, Banda Sea, NW of Binongko, Tukang Besi Islands, 5*52.5'S, 123*58.5'E, 250-290 m, dead, coarse calcareous sand, 10.ix.1984 (SNELLIUS-II stn 4.033).

Description

  Shell up to ca. 8 mm high, weakly inflated, nearly circular, inequivalve, slightly equilateral, auricles unequal in size and shape, umbonal angle ca. 100 degrees, colour whitish, inside glossy.

  Left valve with glossy umbonal region, ca. 10 radial rounded ribs, increasing in interspaces to ca. 15 near the ventral margin. Delicate closely spaced commarginal lamellae on disc and auricles. Right valve also with closely spaced fine commarginal lamellae. Radial riblets on anterior auricle. Ten internal riblets.

Distribution

 

Indonesia, Banda Sea (TL)

Habitat Shells at bathyal depths on gravel and calcareous sand.