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Helicoprion
''Helicoprion'' is a long-lived genus of extinct, shark-like〔http://science.nbcnews.com/_news/2013/02/27/17118881-ancient-shark-relative-had-buzzsaw-mouth?lite〕 eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." ''Helicoprion'' first arose in the oceans of the early Permian〔(Page at Smithsonian National Museum of Natural History )〕 , survived the Permian–Triassic extinction event, and eventually became extinct during the Early Triassic, . The closest living relatives of ''Helicoprion'' (and other eugeneodontids) are the chimaeras.
==Palaeobiology==
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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