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Some, such as the cockles, have shells that are nearly globular; cockles can jump by bending and straightening their foot.

Others, such as the razor clams, are burrowing specialists with elongated shells and a powerful foot adapted for rapid digging.

The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal plane.

Most bivalves bury themselves in sediment where they are relatively safe from predation.

Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts.

Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore.

Bivalves have long been a part of the diet of coastal and riparian human populations.

Oysters were cultured in ponds by the Romans, and mariculture has more recently become an important source of bivalves for food.

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