BIVALVES
As their name indicates, bivalves have two hinged valves or shells which completely protect the body of the animal. Many live buried in soft sediments while other live attached to rocks.
Bivalve shells vary widely in shape, color and size. The smallest measures only 2mm while the largest can reach 1.5m. Among the best known are oysters, razor clams, mussels and cockles.
The largest bivalve mollusc is the Tridakna gigas or giant clam which can weight up to 300 kg and measure up to 1.5m.
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