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Saccostrea cucullata
''Saccostrea cucullata'', the hooded oyster or Natal rock oyster, is a species of rock oyster found mainly in the Indo-Pacific Ocean.
It was first described by the Czech mineralogist, metallurgist, and malacologist Ignaz von Born in 1778.〔
== Description ==
The appearance and form of the hooded oyster is very variable. The shape is sometimes nearly circular or it may be oblong or roughly oval, often with an irregular outline. In the Mediterranean, it grows to , but achieves double that size in the Pacific Ocean. The valves are thick and solid. The lower valve is convex and has no sculpturing near the umbo, which is fixed to the substrate. The upper valve is flat and smaller than the lower valve. It may have wide, sometimes spiny, ribs but is sometimes quite smooth. The margins of the valves are pleated and fit together neatly. The ligament is internal and there are no teeth on the hinge joint. The right valve has some small denticles on its margin which fit into grooves in the left valve margin. A single large adductor muscle holds the valves together, which leaves a large, kidney-shaped scar on the inside of each valve. The colour is purplish-brown on the outside of the valves. The inside is white rimmed with black. This oyster could be confused with the Pacific oyster (''Crassostrea gigas''), but is distinguished by having a crenulated margin.〔
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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