Dall, 1886
Shell equivalve; inequilateral, with posterior end of shell drawn out as a slender spout. Ligament internal, in a small chondrophore; lithodesma present. Cardinal teeth and lateral teeth present or absent, usually small. Pallial line with a small pallial sinus.
Source: Hayward, 1990.
The following subtaxa of this family occur in the region:
Genus Cardiomya
Cardiomya costellata
Genus Cuspidaria
Cuspidaria cuspidata
Cuspidaria obesa
Cuspidaria rostrata