Shape elliptic with slightly convex medial face and slightly concave lateral face. Dorsal depression oblong and shallow. Dorsal margin entire and ventral margin entire. Tapering and rounded at posterior margin. Sulcus ostial, deep. Ostium oval and cauda oblong. Colliculum low. Collum wall-like to raised tubercle. Crista superior and crista inferior well-developed. Neck dorso-ventrally constricted. Rostrum short, broad, rounded. Excisura wide. Notch deep, angle wide.