Ovately triangular shell, equivalve, moderately inflated. inequilateral. Umbones elevated, somewhat in front of the midline of the valve. Dorsal margin markedly slopped, anterior margin narrowly rounded, posterior subangulate. Exterior smooth, with concentric grooves on ovate lunule and escutcheon areas. Well-developed lateral hinge teeth. Thin and adherent periostracum. Pallial sinus round and broad, moderately shallow. Colour: exterior purplish-brown with lighter to darker concentric and radial bands; umbones usually tinged with deep purple. Periostracum brownish. Purple interior with a light grey hue on the hinge and umbonal cavity.