Tridacninae
| Tridacnidae Temporal range: Eocene - recent |
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| The Giant clam Tridacna gigas. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Veneroida |
| Family: | Cardiidae |
| Subfamily: | Tridacnidae Lamarck, 1819 |
| Genera | |
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Tridacnidae, common name, the giant clams, is a taxonomic subfamily of very large saltwater clams, marine bivalve mollusks in the family Cardiidae, the cockles.
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 colored. They inhabit coral reefs in warm seas in the Indo-Pacific region. Most of these clams live in symbiosis with photosynthetic dinoflagellates (zooxanthellae).
Sometimes the giant clams are still treated as a separate family Tridacnidae, but modern phylogenetic analyses included them in the family Cardiidae as a subfamily. Two recent genera and eight species are known:
Recent genetic evidence has shown them to be monophyletic sister taxa.
In some areas, such as the Philippines, smaller members of the family are farmed to supply the marine aquarium trade.
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