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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Astacoides ： ウィキペディア英語版 Astacoides ''Astacoides'' is a genus of freshwater crayfish endemic to Madagascar. The first specimens were brought to Europe in 1839, and seven species are now recognised, most of which are on the IUCN Red List. They are large and slow-growing, and are threatened by habitat loss, overexploitation by local people and by spread of introduced non-indigenous Marbled crayfish (''Procambarus fallax'' f. ''virginalis''). They are only found in a relatively small part of the island, mostly in undisturbed upland areas. They belong to the Gondwana-distributed family Parastacidae, but their nearest relatives live in Australasia, there being no native crayfish in mainland Africa or India. ==Description== ''Astacoides'' species are large for freshwater crayfish, reaching a carapace length of up to in the case of ''A. betsileoensis''.〔 Males and females are similar, except for the organs directly involved in reproduction.〔 Thomas Henry Huxley, in his book ''The Crayfish'', noted that ''Astacoides'' has fewer pairs of gills than any other crayfish, with only 12 pairs compared to 21 pairs in ''Astacopsis''.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Astacoides」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.