Shape elliptic with slightly convex medial face and slightly concave lateral face. Dorsal depression oblong and shallow. Dorsal margin entire and ventral margin serrate. Tapering, notched and sharply rounded at posterior margin. Sulcus ostio-pseudocaudal, deep. Ostium flared and cauda oval and bulbous posteriorly. Colliculum low. Collum wall-like. Crista superior and crista inferior well-developed. Neck slightly dorso-ventrally constricted. Rostrum short, rounded. Excisura wide. Notch shallow, angle wide.