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In all molluscs, the mantle forms a thin membrane that covers the animal's body and extends out from it in flaps or lobes.

Others, such as the razor clams, are burrowing specialists with elongated shells and a powerful foot adapted for rapid digging.The name "bivalve" is derived from the Latin bis, meaning "two", and valvae, meaning "leaves of a door".Drawing of freshwater pearl mussel (Margaritifera margaritifera) anatomy: 1: posterior adductor, 2: anterior adductor, 3: outer left gill demibranch, 4: inner left gill demibranch, 5: excurrent siphon, 6: incurrent siphon, 7: foot, 8: teeth, 9: hinge, 10: mantle, 11: umbo Bivalves vary greatly in overall shape.The shell is typically bilaterally symmetrical, with the hinge lying in the sagittal plane.Adult shell sizes of bivalves vary from fractions of a millimetre to over a metre in length, but the majority of species do not exceed 10 cm (4 in). We are here to help you get the facts and make wise decisions.

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