Tridacna
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Tridacna is a genus of large saltwater clams. These clams are common inhabitants of the Indo-Pacific coral reefs where they live in symbiosis with photosynthetic dinoflagellate algae. The animals get most of their nutrients from the algae. It’s a popular misconception that giant clams can hurt divers by becoming trapped between the shell. This is just a myth. While the shell does close, this reaction is quite slow.