Family Pharidae H. Adams & A. Adams, 1856 (= Cultellidae Davies, 1935)

Diagnosis: Shell cylindrical, quadrate to ovate, laterally compressed, inequilateral, longer posteriorly, umbos terminal to sub-terminal, external surface smooth, some species with commarginal striae and ribs; hinge plate thin, right valve with a single vertical and a single horizontal cardinal tooth; left valve with two vertical and two horizontal cardinal teeth; lateral teeth absent; posterior adductor muscle smaller that anterior one, pallial sinus shallow to moderately deep; pedal gape and fourth mantle aperture usually present; foot large, compressed, obliquely truncate.