PROPEAMUSSIIDAE

Parvamussium australanum

Dijkstra & Maestrati, 2010

Figures

           

                                                   Holotype                                                   

Original name   Parvamussium australanum Dijkstra & Maestrati, 2010
Autoreference   Dijkstra & Maestrati, 2010: 335-336, figs 2A-E.
Reference   Dijkstra, H.H. & P. Maestrati, 2010. Pectinoidea (Mollusca, Bivalvia, Propeamussiidae, Entoliidae and Pectinidae) from the Austral Islands (Frnch Polynesia. - Zoosystema 32 (2): 333-358, 5 figs, 4 tabs.
Type data   Holotype (H 11.5 mm, L 11.2 mm, D 2.4 mm) Muséum National d'Histoire Naturelle (MNHN 21377). Type locality: Austral Islands, east of Rapa Island, 27*37'S, 144*15'W, 800-850 m, alive, N.O. "Alis", leg. P. Bouchet & B. Richer de Forges, 07.xi.2002 (BENTHAUS stn CP 1891).
Description

  Shell up to ca. 12 mm high, fragile, opaque white to semi-transparent, glossy near umbonal area, left valve slightly more convex than right valve, almost circular, inequivalve and nearly equilateral, auricles unequal in shape and size.

  Left valve sculptured with ventrally curled, distinct narrow commarginal lamellae. Right valve with closely spaced, weak commarginal lirae. Marginal apron often broken off. Byssal notch shallow, byssal fasciole narrow (almost lacking). Internal ribs 10-11, in some specimens lacking or only rudimentary in the central part.

Distribution

 

Austral Islands (TL)

Habitat  Living bathyally at 500-800 m.