PROPEAMUSSIIDAE  

Parvamussium retiolum

Dijkstra, 1995

Figures

 

       rv                     Holotype                           lv

Original name   Parvamussium retiolum Dijkstra, 1995
Autoreference   Dijkstra, 1995: 29, figs 39-42, 97.
Reference   Dijkstra, H.H., 1995. Bathyal Pectinoidea (Bivalvia: Propeamussiidae, Entoliidae, Pectinidae) from New Caledonia and adjacent areas. In: P. Bouchet (ed.), Résultats des Campagnes MUSORSTOM, volume 14. - Mémoires du Muséum National d'Histoire Naturelle 167: 9-73, figs 1-154.
Type data   Holotype (pr: H 16.0 mm, L 14.8 mm, D 3.5 mm) Museum National d'Histoire Naturelle, Paris (MNHN). Type locality: Coral Sea, Chersterfield Islands, 19*47'S, 158*44'E, 685-700 m, alive (MUSORSTOM 5 stn CP 363).
Description

  Shell small up to ca. 16 mm high, fragile, semi-transparent white, inflated, circular, higher than wide, left valve slightly more convex than right valve, inequivalve and inequilateral, somewhat posteriorly oblique, auricles strongly unequal in size and shape, umbonal angle ca. 95 degrees.

  Left valve sculptured with closely spaced, commarginal lamellae and radial riblets (reticulate appearance). Anterior auricle with fine radial riblets, crossed by fine commarginal lamellae. Right valve with regularly spaced, fine commarginal lirae. Anterior auricle strongly sculptured near lateral margin with commarginal lamellae. Byssal notch relatively deep, byssal fasciole narrow. Internal riblets 10 extending to the submarginal region.

Distribution

 

Philippines, Chesterfield Islands(TL), New Caledonia, Fiji, Tonga, Lord Howe Rise, Norfolk Ridge

Habitat   Living bathyally on soft bottom assemblages.