Shape elliptic to ovate with convex medial face and concave lateral face. Dorsal margin and ventral margin slightly crenate. Sulcus ostial, deep. Ostium and cauda elongate. Colliculum low. Collum raised tubercle. Crista superior and crista inferior well-developed, both poorly-developed at posterior tip. Neck slightly constricted. Rostrum short, pointed. Excisura narrow. Notch very shallow.