Fairly large,thin and fragile shell with median elevated umbones; inequilateral, inflated; anterior part longer, both anterior and posterior margins broad and rounded. Exterior ornamented with fine concentric striae and conspicuous growth lines. Lateral hinge teeth well-developed. Pallial line and sinus shallow and broad. Colour: unicolour as violet; umbones deep violet. Inside also violet, but hinge white. Periostracum pale brown.