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Austropotamobius pallipes
''Austropotamobius pallipes'' is an endangered European freshwater crayfish, and the only species of crayfish native to the British Isles.〔(【引用サイトリンク】title=Freshwater white-clawed crayfish (''Austropotamobius pallipes'') )〕 Its common names include white-clawed crayfish and Atlantic stream crayfish.
==Distribution and ecology==
It is found from the Balkan Peninsula to Spain and reaches its northerly limit in Great Britain and Ireland, where it also has its greatest population density.
''Austropotamobius pallipes'' is the only species of crayfish found in Ireland, occurring over limestone areas inhabiting rivers, streams, canals and lakes. They are absent from the more acidic waters of the west. They occur in streams with a moderate flow alongside other freshwater invertebrates such as caddis fly, mayfly and mollusc species. Trout and three-spined stickleback also occur in the same habitat. Tree roots, rocks in the banks provide shelter. Juveniles shelter in vegetation such as watercress and grass mats growing out of the bank.
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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