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The generally accepted systematic name (in contrary to some others) of all mussels, clams and scallops-Bivalvia-the two-valve molluscs-refers to the most important character of all bivalves, that separates them from all other molluscs: The shell is separated into two pieces. bivalve's foot is adapted to how it lives and moves. So there are different types of feet in bivalves, from beam-shaped, tongue-shaped or worm-shaped feet. Swimming mussels, as well as completely sessile mussels, often have a largely reduced foot.
Bivalves are aquatic mollusks that have hinged shells but no head or jaws. The large gills in most bivalves draw oxygen and food from the surrounding water. Mucus traps the food, and cilia move the mucus-bound food to the mouth.