Shape square, dumpling-Shaped. Dorsal depression deep, fan-shaped. Ventral margin approximately entire and irregular, crenate elsewhere. Sulcus mesial, shallow, hill-like swelling above neck. Ostium bifid with extended antero-ventral corner, downward. Cauda elongate, tube-like and slightly bulbous posteriorly. Colliculum high, irregular. Crista superior and crista inferior poorly-developed. Neck slightly constricted. Rostrum absent. Excisura absent. Notch absent.