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Metriorhynchus
''Metriorhynchus'' is an extinct genus of marine crocodyliform that lived in the oceans during the Middle to Late Jurassic. ''Metriorhynchus'' was named by the German palaeontologist Christian von Meyer in 1830.〔 ''Metriorhynchus'' was a carnivore that spent much, if not all, its life out at sea. No ''Metriorhynchus'' eggs or nests have been discovered, so little is known of the reptile's life cycle, unlike other large marine reptiles of the Mesozoic, such as plesiosaurs or ichthyosaurs which are known to give birth to live young out at sea. Where ''Metriorhynchus'' mated, whether on land or at sea, is currently unknown. The name ''Metriorhynchus'' means "Moderate snout", and is derived from the Greek ''Metrio''- ("moderate") and -''rhynchos'' ("snout").
==Discovery and species==
Fossil specimens referrable to ''Metriorhynchus'' are known from Middle-Late Jurassic deposits of England, France and Germany.〔Steel R. 1973. Crocodylia. ''Handbuch der Paläoherpetologie, Teil 16''. Stuttgart: Gustav Fischer Verlag,116 pp.〕
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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