Mussels are members of the molluscan Class Bivalve along with clams and scallops. Attaching to the substrate and each other with byssal threads , mussels often form dense beds that support rich invertebrate assemblages . Mussel larvae remain in the water column for several weeks. Mussels are suspension feeders, filtering plankton and other small particles from the water column. Mussels are preyed upon by sea stars, gastropods and crabs.