"Shell medium-sized, up to 46 mm high, higher than wide, thin, fragile and somewhat translucent, inequivalve, left valve convex, right valve flat. Exterior of left valve with very irregular small and close-set concentric lamellae, crossed by irregular radial costae, giving the surface a cancellate appearance. In the dissoconch stage only concentric lamellae are visible, the radial costae start only at about 4-8 mm from the beaks. Concentric lamellae more pronounced near the sides and the ventral margin. Sculpture continued on the auricles, no interruption between the shell disk and the auricles. Anterior auricle slightly longer than posterior auricle. Internal sculpture of left valve composed of irregular radial plicae reproducing the external irregular radial sculpture. Exterior of right valve somewhat smooth with irregular growth lines, becoming coarser towards the ventral margin. In addition, on both valves irregular concentric low waves or irregular depressions; surface strongly deformed with a "Hinnites" - like appearance. Auricles of right valve with radial ribs directly under the hinge line, bearing tiny scales where growth lines are crossed. No byssal notch; inactive and active ctenolium present. Interior reproducing the exterior deformed disc. Hinge line straight with a rather broad triangular resilium pit and a very small outer ligament. Exterior surface milky white, interior more or less polished and silvery." {fide Dijkstra, 1989) Size: Normal adult size range is 35 to 45 mm.

Known from the Philippines, New Caledonia and Indonesia. Habitat: Deep water, muddy and sandy bottoms with gravel.