The overall shape is trigonal ovate. The anterior and ventral margins are rounded, and the posterior margin is subtruncated. The anterior dorsal margin is subconcave, and the posterior dorsal margin is subconvex. The posterior half of the flank is slightly more inflated than the anterior. The valves are equal in size and shape (equivalve), and there is no gape when they are closed. Sculpture consists of growth lines and very fine, dense comarginal ribs ventrally. There may be a slight sinuosity at the confluence of the posterior and central areas of the flank. The lunule is smooth, lightly impressed and defined by a fine shallow groove; it is rounded in shape and extends 3/4 of the anterior dorsal margin. The commissural margin may be lightly raised at the center of the lunule. The umbo is subanterior and prominent, and the beaks point slightly to the anterior. The escutcheon is not well defined.

The exterior color is white, and there may be light brown coloration at the posterior. The interior is white.

The ligament is external, extends half the posterior dorsal margin and is supported by nymphal ridges. On the left valve, there are three cardinal teeth (2a, 2b, 4b), none of which are bifid. The anterior (2a) and central (2b) teeth are joined near the hinge, forming an inverted "V" shape. The posterior tooth (4b) is fused with the nymph. There is also one anterior later tooth (A2) on the left valve. On the right valve, there are three cardinal teeth: the anterior (3a) and central (1) teeth are not bifid, and the posterior tooth (3b) is bifid. There are also two anterior lateral teeth (A1, A3), as well as a fine ridge running parallel to the posterior dorsal margin on the right valve. The anterior and posterior adductor muscle scars are similar in size, and the posterior is slightly more rounded than the anterior. The pallial sinus is rounded and extends to the middle of the nymph in length.