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Pacifastacus fortis
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Pacifastacus fortis : ウィキペディア英語版
Pacifastacus fortis

''Pacifastacus fortis'' (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found only in isolated spots on the Pit River and Fall River Mills.
==Description and ecology==
''P. fortis'' is thick and stocky, with relatively heavy chelae. It is usually dark brown dorsally with bright orange areas on its underside. It grows about 2-4 inches long. It lives in cold, clear, rocky areas of the mountain rivers, and feeds on the slime coating the rocks. The animal requires a constant, steady, and untainted flow of fresh water to survive.

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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