Sexual differences in the shell indistinct. 74-97 Shell relatively thin to moderately thick, rounded or oval to elongate. Beak sculpture generally double-looped but often indistinct. Surface of the shell mostly light yellow or tan with brightly colored rays or bands. Pseudocardinal and lateral teeth usually well-developed.
Right valve has one cardinal tooth and two pairs of lateral teeth.
Surface of the shell yellowish brown to black, with numerous, evenly spaced, concentric, elevated ridges. Surface variably banded with black or brown and cream stripes.