Retzius, 1781
Attached by part or all of pedicle valve; ornament of concentric growth lines, low discontinuous radial lines present or absent; margins of both valves thickened, pustulose, may form limbus, anterior adductor scars close together; branchial valve conical to subconical.
Source: Moore, 1965.
The following species that belong to this genus occurs in this region:
Crania anomala