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Acanthoceras rhotomagensis : ウィキペディア英語版 | Acanthoceras rhotomagensis
''Acanthoceras rhotomagensis'' is an extinct cephalopod genus belonging to the subclass Ammonoidea and family Acanthoceratidae. These fast-moving nektonic carnivores lived during the Cenomanian stage of the Late Cretaceous (from 94.3 to 89.3 Ma).〔( Paleobiology Database )〕〔(Encyclopedia of life )〕 ==Description== Shells of ''Acanthoceras rhotomagensis'' may reach a diameter of about . Their shells have ornate ribs.〔(Ammonites )〕〔Claire E. L. Still ( The effects of sexual dimorphism on survivorship in fossil ammonoids: A role for sexual selection in extinction )〕
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「Acanthoceras rhotomagensis」の詳細全文を読む
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