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Tridacninae
Tridacninae, common name, the giant clams, is a taxonomic subfamily of very large saltwater clams, marine bivalve mollusks in the family Cardiidae, the cockles. ==Description== This family contains the largest living bivalve species, including ''Tridacna gigas'', the giant clam. They have heavy shells, fluted with 4–6 folds. The mantle is usually brightly coloured. They inhabit coral reefs in warm seas in the Indo-Pacific region. Most of these clams live in symbiosis with photosynthetic dinoflagellates (zooxanthellae).
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