Dall, 1901
Shell equivalve, inequilateral. Ligament external. Hinge line without teeth. Typically with a fine concentric sculpture, growth stages indistinct. Adductor scars about equal. Pallial line unclear, without sinus.
Source: Hayward, 1990.
The following subtaxa of this family occur in the region:
Genus Thyasira
Thyasira croulinensis
Thyasira equalis
Thyasira ferruginea
Thyasira flexuosa
Thyasira gouldi
Thyasira sarsi