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Pucapristis
''Pucapristis'' is a prehistoric genus of saw fish whose fossils first appear in the fossil record in rocks dating from the Maastrichtian stage. Fossils of ''Pucapristis'' have not been found in any subsequent strata. Incidentally, the Maastrichtian is the final portion of the Cretaceous Period and its endpoint marks the advent of the Cretaceous–Paleogene extinction event. This major geological transition is famous for being the mass extinction that wiped out the dinosaurs. ==Classification==
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「Pucapristis」の詳細全文を読む
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