giant clam
The largest living bivalve mollusc (Tridacna gigas); length up to 135 cm/2½ ft; weight over 250 kg/550 lb; found in Indo-Pacific seas in shallow water; its mantle tissues contain many microscopic algae, which it digests. (Class: Pelecypoda. Family: Tridacnidae.)
Portions of the summary below have been contributed by Wikipedia.
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