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''Cephalorhynchus'' is a genus in the dolphin family Delphinidae. It consists of four species: *Commerson's dolphin, ''C. commersonii'' *Chilean dolphin, ''C. eutropia'' *Haviside's dolphin, ''C. heavisidii'' *Hector's dolphin, ''C. hectori'' The species have similar physical features — they are small, generally playful, blunt-nosed dolphins — but they are found in distinct geographical locations. A phylogenetic analysis by indicated the two species traditionally assigned to the genus ''Lagenorhynchus'', the hourglass dolphin ''L. cruciger'' and Peale's dolphin ''L. australis'' are actually phylogenetically nested among the species of ''Cephalorhynchus'', and they suggest these two species should be transferred to the genus ''Cephalorhynchus''. Some acoustic and morphological data support this arrangement, at least with respect to Peale's dolphin. According to , Peale's dolphin and the ''Cephalorhynchus'' species are the only dolphins that do not whistle (no acoustic data are available for the hourglass dolphin). Peale's dolphin also shares with several ''Cephalorhynchus'' species the possession of a distinct white "armpit" marking behind the pectoral fin. ==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「Cephalorhynchus」の詳細全文を読む スポンサード リンク
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