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A clam shell (species Spisula solidissima) at Sandy Hook, New Jersey. Clam is a common name for several kinds of bivalve mollusc.The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the sea floor or riverbeds.
As well as being eaten by humans, the soft-shelled clam is relished by sea otters in the eastern Pacific Ocean, [citation needed] where the clam is an invasive species. In New England the soft-shell clam is preyed heavily upon by northern moon snails and invasive green crabs. They are also a favorite of gulls, which pull the clam from the sand ...
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]
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.
Pinna nobilis, known by the common names noble pen shell and fan mussel, is a large species of Mediterranean clam, a marine bivalve mollusc in the family Pinnidae, the pen shells. [2] It reaches up to 120 cm (4 ft) of shell length. [3] It produces a rare manganese-containing porphyrin protein known as pinnaglobin. [4]
The shells of surf clams show growth rings and can demonstrate changes in the environment of the individual. The shells are formed by calcification, as the clam deposits calcium carbonate into the shell via either diet or metabolism. Pausing of growth due to internal or external factors appear marked by dark lines of growth on the shell.
The razor shell, Ensis magnus, also called razor clam, razor fish [2] or spoot (colloquially), is a bivalve of the family Pharidae. It is found on sandy beaches in Canada and northern Europe (north of the Bay of Biscay ).
Its streamlined shell and strong foot allow Jackknife clams to burrow quickly in wet sand. Jackknife clams are also able to swim by propelling jets of water out of their shells. The Jackknife clam gets its name from its shell's extremely sharp rim and the overall shape bearing a strong resemblance to an old fashioned straight razor. Beachgoers ...