Pacific Razor Clam

Is this a clam or a brachiopoda? Brachiopoda look a little like clams, with two shells on the outside. Upon closer inspection of the shells, however, each half is symmetrical and but is different from the other half. Bivalves do not have symmetrical shells and the two shells do mirror each other. Brachiopods also hold onto the ground with a muscular foot called a pedicle while mollusks use a thread-like structure. And, of course, brachiopods have a lophophore and mollusks do not. Brachiopods are also called lamp shells.