Fusiform in shape with convex medial face and concave lateral face. Dorsal depression grooved, fan-shaped. Dorsal margin and ventral margin slightly serrate. Sulcus ostial, deep. Ostium flared and cauda elongate, flexed at posterior. Colliculum high in the middle of sulcus. Crista superior ridge-like and crista inferior well-developed, absent at posterior. Neck dorso-ventrally constricted. Rostrum extended, pointed. Excisura wide. Notch shallow.