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