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''Naja'' is a genus of venomous elapid snakes known as cobras. Several other genera include species commonly called cobras (for example the rinkhals, or ring-necked spitting cobra (haemachatus'' )), but of all the snakes known by that name, members of the genus ''Naja'' are the most widespread and the most widely recognized as cobras. Various species occur in regions throughout Africa, Southwest Asia, South Asia and Southeast Asia. Until recently the genus ''Naja'' had 20 to 22 species, but it has undergone several taxonomic revisions in recent years, so sources vary greatly. There is however wide support for a 2009 revision that synonymised the genera ''Boulengerina'' and ''Paranaja'' with ''Naja''. According to that revision the genus ''Naja'' now includes 28 species. ==Etymology== The origin of this genus name is from the Sanskrit ''nāga'' (with a hard "g") meaning "snake". Some hold that the Sanskrit word is cognate with English "snake", Germanic: '' *snēk-a-'', Proto-IE: '' *(s)nēg-o-'',〔(【引用サイトリンク】url=http://starling.rinet.ru/cgi-bin/response.cgi?single=1&basename=/data/ie/piet&text_number=2649&root=config )〕 but this is unlikely. Mayrhofer calls this etymology "''unglaubhaft'' ", "not credible", and suggests a more plausible etymology connecting it with Sanskrit ''nagna,'' "hairless, naked". 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「naja」の詳細全文を読む スポンサード リンク
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