Lamarck, 1818
Shell thick and strong, tumid, oval, quadrate or irregular in outline; equivalve, inequilateral, umbones anterior to midline, widely separated. Ligament external, extending between umbones across a broad, grooved, diamond-shaped cardinal area. Hinge line straight, with a continuous series of identical teeth, alternating with sockets. Adductor muscle scars about equal. No pallial sinus.
Source: Hayward et al., 1990.
The following subtaxa of this family occur in the region:
Genus Arca
Arca nodulosa
Arca tetragona
Genus Bathyarca
Bathyarca pectunculoides