Shape rectangular with slightly convex medial face and flat lateral face. Dorsal margin slightly serrate, irregular and ventral margin serrate, irregular and digitate, notched at posterior margin. Sulcus ostio-caudal, deep. Ostium and cauda flared, deep. Colliculum low and indistinct. Crista inferior and crista superior well-developed. Neck slightly dorso-ventrally constricted. Rostrum short, pointed. Antirostrum small and rounded. Pseudorostrum short and rounded. Pseudoantirostrum small and rounded. Excisura moderately wide. Notch shallow, angle wide.