Ovate to fusiform in shape with convex medial face and concave lateral face. Dorsal depression shallow. Dorsal margin and ventral margin approximately entire. Sulcus ostial, deep. Ostium flared, reduced. Cauda elongate, slightly bulbous and flexed ventrally at posterior. Colliculum in the middle of sulcus. Collum large, wall-like. Crista superior and crista inferior well-developed, both poorly-developed at posterior. Neck slightly dorsally constricted. Rostrum very extended, bar-like. Excisura wide. Notch shallow.