| Tridacninae | |
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| Two "giant clams", from the two current genera : Hippopus hippopus & Tridacna squamosa. | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Cardiida |
| Family: | Cardiidae |
| Subfamily: | Tridacninae Lamarck, 1819 |
| Genera | |
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See text | |
Tridacnidae, common name the giant clams, is a taxonomic subfamily of very large saltwater clams, marine bivalve molluscs in the family Cardiidae, the cockles.