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
Tridacna derasa in a reef aquarium.
Giant clam
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Tridacna gigas, the giant clam, is the most well-known species of the giant clam genus Tridacna. Giant clams are the largest living bivalve mollusks. Several other species of "giant clams" in the genus Tridacna, are often misidentified as Tridacna gigas.
Giant clam
Mantle of giant clam with light-sensitive spots which detect danger and cause the clam to close
Giant clam in Bunaken island, Sulawesi, Indonesia
Empty giant clam shell in the French National Museum of Natural History