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Metriorhynchidae
Metriorhynchidae is an extinct family of metriorhynchoid crocodyliforms from the Middle Jurassic to the Early Cretaceous period (Bajocian - Valanginian stages) of Europe, North America and South America. Metriorhynchids are fully aquatic crocodyliforms. Their forelimbs were small and paddle-like, and unlike living crocodilians, they lost their osteoderms ("armour scutes"). Their body shape maximised hydrodynamy (swimming efficiency), as did having a shark-like tail fin.〔Fraas E. 1902. Die Meer-Krocodilier (Thalattosuchia) des oberen Jura unter specieller Berücksichtigung von ''Dacosaurus'' und ''Geosaurus''. ''Paleontographica'' 49: 1-72.〕
Metriorhynchids were the only group of archosaurs (aside from seabirds) to become fully adapted to the marine realm, becoming pelagic in lifestyle.〔Steel R. 1973. ''Crocodylia. Handbuch der Paläoherpetologie, Teil 16''. Stuttgart: Gustav Fischer Verlag,116 pp.〕
The name Metriorhynchidae was coined by the Austrian zoologist Leopold Fitzinger in 1843.〔Fitzinger LJFJ. 1843. ''Systema Reptilium''. Wien: Braumüller et Seidel, 106 pp.〕 It contains two subfamilies, the Metriorhynchinae and the Geosaurinae.
==Geographical distribution==
The family has a wide geographic distribution, with material found in Argentina, Chile, Cuba, England, France, Germany, Italy, Mexico, Poland, Russia and Switzerland.〔〔
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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