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Pinctada margaritifera
''Pinctada margaritifera'', commonly known as the Black-Lip Pearl Oyster, is a species of pearl oyster, a saltwater clam, a marine bivalve mollusk in the family Pteriidae. This species is common in the Indo-Pacific within tropical coral reefs.
The ability of ''Pinctada margaritifera'' to produce pearls means that the species is a valuable resource to humans. The oysters are harvested wild from coral reefs and are also commonly grown in aquaculture, both primarily taking place in the Indo-Pacific region.
==Description==
The common name of this species refers to the fact that there is black coloring along the margins of the interior of the shell. Externally the shell is dark grayish brown or green, though white spots are common across the shell. Adults usually reach between 200mm and 250mm in height. A distinctive feature of the species is that the hinge has no teeth.
(The genera ''Pinctada'' and ''Pteria'' are often confused. In ''Pinctada'' the hinge is long and straight, the long end of the shell forms a right angle to the hinge, and the left valve is slightly deeper than the right. In the genus ''Pteria'', the shell width is much longer than its height and the angle of the hinge is prominent and pronounced.)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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