The overall shape is elongate ovate. The anterior and ventral margins are rounded, and the posterior margin is subtruncated. The anterior dorsal margin is straight, and the posterior dorsal margin is subconvex. The valves are equal in size and shape (equivalve), and there is no gape when they are closed. Sculpture consists of growth lines only. The lunule is spear-shaped, extends 2/3 of the anterior dorsal margin, and is defined by a fine shallow groove. The commissural margin is lightly raised at the center of the lunule, but it does not extend above the shell flank. The umbones are anterior and the beaks point slightly to the anterior. The escutcheon is not well defined.
The exterior is white with light brown zig-zag patterns dorsally, fading into brown coloration with white rays. There may also be a purple or brown blotch on the posterior end of the lunule, near the umbo. The interior is white.
The ligament is external, but slightly sunken; it extends 1/3 of 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 connected near the hinge plate, forming an inverted "V" shape. The posterior tooth (4b) is parallel to the nymph, but not fused with it. There is also one anterior lateral 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 posterior adductor muscle scar is slightly larger and rounder than the anterior adductor muscle scar. The pallial sinus is rounded and extends to the posterior end of the nymph in length.
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