MOLLUSKS all have soft bodies surrounded by a hard shell. They include the bivalves, which have two hinged shells, like clams; the gastropods or snails, with a single shell that is often coiled in a spiral; and polyplacophores or chiton, whose shells are made up of a number of small overlapping plates.
Bivalve with thin, smooth blue or brown oval shell
Attached to rocks or pilings by a “beard” (byssus)
Edible and prized for its delicate flavor
Fast-growing filter feeder