Saxidomus gigantea (Deshayes 1839)

The hinge on Saxidomus gigantea is external.

Saxidomus gigantea has three cardinal hinge teeth on each valve but no chondrophore.

The two adductor muscle scars are of similar size. There is a continuous pallial line and a well-developed pallial sinus.

The siphons are united and black on the tips.

Saxidomus gigantea shell from Padilla Bay, WA (Photo by: Dave Cowles, August 2005)