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Mantle of giant clam with light-sensitive spots, which detect danger and cause the clam to close. Tridacna gigas, the giant clam, is the best-known species of the giant clam genus Tridacna. Giant clams are the largest living bivalve mollusks. Several other species of "giant clam" in the genus Tridacna are often misidentified as Tridacna gigas.
Tridacna is a genus of large saltwater clams, marine bivalve molluscs in the subfamily Tridacninae, the giant clams. Many Tridacna species are threatened. They have heavy shells, fluted with 4 to 6 folds. The mantle is often brightly coloured. They inhabit shallow waters of coral reefs in warm seas of the Indo-Pacific region. [2]
Sometimes the giant clams are still treated as a separate family Tridacnidae, [1] but modern phylogenetic analyses included them in the family Cardiidae as a subfamily. [2] [3] Two recent genera and eight species are known: Hippopus—2 species; Tridacna—10 species; Recent genetic evidence has shown them to be monophyletic sister taxa. [4]
Tridacna squamosa, known commonly as the fluted giant clam and scaly clam, is a species of bivalve in the family Cardiidae. [ 1 ] [ 3 ] It is one of a number of large clam species native to the shallow coral reefs of the South Pacific and Indian Oceans .
Tridacna noae, also known as Noah’s giant clam or the Teardrop giant clam, is a species of giant clam. Up until recently, T. noae was confused with the small giant clam Tridacna maxima, [4] [5] but is now known to be its own independent species. It has a broad distribution in the Indo-Pacific. [4]
The southern giant clam is a popular food item and aquarium species, and has therefore been hunted extensively throughout its natural habitat. [6] However, specimens traded today tend to be the result of aquaculture farms rather than wild-caught individuals, because the southern giant clam was one of the first clams to be bred commercially. [6]
Hippopus hippopus, also known as the Horse Hoof clam and Strawberry clam, is a species of giant clam in the Subfamily Tridacninae and the genus Hippopus. Hippopus is a delicacy in many Southeast Asian countries due to its high quality meat.
The shell of the clam ranges from 15 centimetres (6 in) to over 20 centimetres (8 in) in length, but the extremely long siphons make the clam itself much longer than this: the "shaft" or siphons alone can be 1 metre (3 ft 3 in) in length. The geoduck is the largest burrowing clam in the world. [3]