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The genus ''Carduelis''〔From Latin ''carduus'', "thistle". Thistle seeds are a favorite food of many species.〕 is a group of birds in the finch family Fringillidae. A large number of bird species were at one time assigned to the genus but it became clear from phylogenetic studies of mitochondrial and nuclear DNA sequences that the genus was polyphyletic. The polyphyletic nature of the genus was confirmed by Dario Zuccon and coworkers in a comprehensive study of the finch family published in 2012. The authors suggested splitting the genus into several monophyletic clades, a proposal that was accepted by the International Ornithologists' Union. The siskins and goldfinches from the Americas formed a distinct clade and were moved to the resurrected genus ''Spinus'', the greenfinches were moved to the genus ''Chloris'', the twite and linnets formed another clade and were moved to the genus ''Linaria'' and finally the redpolls were moved to the genus ''Acanthis''. The genus ''Carduelis'' is now restricted to three European species:〔 * European goldfinch, ''Carduelis carduelis'' * Citril finch, ''Carduelis citrinella'' * Corsican finch, ''Carduelis corsicana'' ==References== 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「Carduelis」の詳細全文を読む スポンサード リンク
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