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Scallop (/ ˈ s k ɒ l ə p, ˈ s k æ l ə p /) [a] is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops.However, the common name "scallop" is also sometimes applied to species in other closely related families within the superfamily Pectinoidea, which also includes the thorny oysters.
Chlamys hastata, the spear scallop, spiny scallop or swimming scallop, is a species of bivalve mollusc in the family Pectinidae found on the west coast of North America from the Gulf of Alaska to San Diego, California. A limited number of these scallops are harvested by divers or by narrow trawls off the west coast of Canada.
The giant scallop is equilateral (i.e., symmetrical anterior-to-posterior) and very nearly equivalved (i.e., its left and right valves are close to the same size and shape), though this is not true of all or even most members of the class pectinidae.
Original – Anatomy of the right side of a scallop, including detailed information on the circulation and nervous systems as well as all the major organs. Note that the intestines are embedded within the gonad, and that portions of the left side (principally the gills and the shell) are not shown.
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The pink scallop can be distinguished from its close relative the spiny scallop (Chlamys hastata) by the valves being rather more rounded and by the lack of spines on the ribs which gives it a smooth texture. The glossy white interior of the shell does not have the purplish markings that are sometimes present in the spiny scallop. [2]
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A rock scallop with a sponge covering its shell. Adults of Crassadoma gigantea have one valve (the right valve) fixed to a base, often a vertical rock face. This valve often becomes deformed to fit the contours of the rock. The left valve is roughly circular but irregular in outline, thick and heavy, with deep radial ribs.