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Cretolamna
''Cretolamna''〔The spelling of the name is controversial; the original spelling is ''Cretalamna'', but currently both spellings are in use. For comments on the spelling of the genus name see: 〕 is an extinct mackerel shark that belonged to either the family Cretoxyrhinidae or Otodontidae. These sharks lived during from the Barremian of the Cretaceous period to the Mid Miocene epoch, approximately from 130.0 to 13.65 million years ago.〔(Fossilworks )〕〔 ==Etymology== The genus name ''Cretolamna'' means ''Cretaceous Lamna'', as the first specimens of these Lamniformes sharks have been found in Cretaceous aged sediments.〔
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「Cretolamna」の詳細全文を読む
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