King, 1859
Biconvex, rectimarginate to sulcate, thin, smooth or with fine radial sculpture, punctae minute and rather distant; beak obtuse, suberect to erect; beak ridges ill-defined; foramen permesothyridid, attrite; deltidial plates weak. Hinge teeth strong, supported by dental plates, which are united by callus deposit closely applied to floor of valve; crural bases fused with socket ridges, from which 2 hinge plates steeply descend to valve floor, not supported by septum but excavated anteriorly at their sides; loop dalliniform. Diductor muscles attached to small transverse impression over dorsal umbo.
Source: Moore, 1965.
The following species that belong to this genus occurs in this region:
Macandrevia cranium