Bivalves have shells which are divided into two jointed halves called valves. Bivalves have no head, and also lack a radula. They are laterally compressed, and the two halves of it's shell are attached dorsally. The oldest part of the shell is called the umbo. Large muscles called adductor muscles keep the two halves closed. When these muscles relax, the two halves open, and allow the foot to come out for movement and burrowing. Bivalves are typically filter feeders, usually consuming plankton. Different types of bivalves include clams, oysters, muscles, and scallops.
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