Tridacna derasa
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Tridacna derasa, the southern giant clam or smooth giant clam, is a species of extremely large marine clam in the family Cardiidae.
Tridacna derasa 1
Tridacna derasa in a reef aquarium.
Giant clam
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Tridacna gigas, the giant clam, is the best-known species of the giant clam genus Tridacna. Giant clams are the largest living bivalve molluscs. Several other species of "giant clam" in the genus Trid
Tridacna derasa
…its thick shell. The smoothness of the southern giant clam's shell and its six to seven vertical folds help to distinguish it from its larger relative, Tridacna gigas, which has four to five folds and a rougher texture. Lack of scutes (scale-like protrusions of the shell) that are present in most other Tridacna species…
Giant clam Michaelmas Cay
Mantle with light-sensitive spots, which detect danger and cause the clam to close
In Bunaken Island, Sulawesi, Indonesia
Empty shell in the French National Museum of Natural History