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Ostrea edulis
''Ostrea edulis'' is a species of oyster native to Europe and commonly known as the European flat oyster, Colchester native oyster (hence Cilchester natives), mud oyster, or edible oyster (despite this latter name it is not the only oyster that is edible by humans).
The fossil record of this species dates back to the Miocene (age range: 15.97 to 0.012 million years ago). These fossils have been found in Belgium, Italy, the Netherlands, Egypt, Greece, Spain, the United Kingdom, Austria, France and Germany. 〔(Fossilworks ) 〕
==Description==
When mature, ''O. edulis'' adults range from across.
Shells are oval or pear shaped, white, yellowish or cream in colour, with a rough surface showing pale brown or bluish concentric bands on the right valve. The two valves are quite different in shape and size, as the left one is concave and fixed to the substratum, while the right one is almost flat and fits inside the left. The inner surface is smooth, whitish or bluish-grey and pearly (the opalescent ''mother of pearl''). An elastic ligament holds together these two valves. The meat of these molluscs may vary from creamy beige to pale gray. 〔(FAO ) 〕
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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