Shell, white, nacrous internally, fragile, somewhat inflated, up to 30 radial, rounded ribs, spaced more or less equidistant from anterior ventral margin to posterior ventral margin close to base of rostrum, most prominent midventrally, at most one or two faint anterior dorsal ribs with occasional secondary ribs central to primary ribs; posterior dorsal margin straight, anterior dorsal margin short and raised, anterior margin obliquely angled and flattened, ventral margin with a distinct rostral sinuation; rostrum moderately long, broad, well defined, with three or four fine raised oblique striae; no teeth on left hinge, posterior lateral tooth on right hinge, resilifer triangular. Maximum length 8.1 mm.

North America Basin, Argentine Basin, west European Basin. Depth range: 1661-2888 m.