Protothaca Dall, 1902

Protothaca asperrima (Sowerby, 1835)

Protothaca columbiensis Sowerby

Protothaca crassicosta (Deshayes, 1835)

Protothaca granulata (Gmelin, 1791)

Protothaca grata (Say, 1830)

Protothaca laciniata (Carpenter, 1864)

Protothaca metodon (Pilsbry & Lowe, 1932)

Protothaca pectorina (Lamarck, 1818)

Protothaca staminea (Conrad, 1837)

Protothaca stuchburii (Gray in W. Wood, 1828)

Protothaca tenerrima (Carpenter, 1857)