Shell small, thin, ovate-trigonal, almost equivalve, white; rostrum short, truncated. Anterior and posterior dorsal slopes fairly straight. Ventral margin gently convex, barely incurved at the base of the broad truncated rostrum. Anterior end rather narrowly rounded low down on the same level as the rostrum. The lower angle of the rostrum marks a weak angulation which proceeds towards the umbo, but fades out entirely before reaching it. Sculpture of weak microscopic closely spaced concentric growth lines. Hinge of left valve edentulous, that of right valve with an anterior and a posterior lateral, the latter being lamellate triangular and projecting forwards into the left valve. There is a broad rounded pallial sinus. Length 4,4 mm.; height 2,9 mm.; thickness (one valve) 0,9 mm. (Holotype).

New Zealand. Off Three Kings Islands, St. 933, 260 m.