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''Megalneusaurus'' is an extinct genus of large pliosaur that lived in the Sundance Sea during the Kimmeridgian, ~156-152 million years ago, in the Late Jurassic. The genus and type species was based upon ribs, vertebrae, a fore-paddle and fragments of the pectoral girdle discovered in Wyoming, USA in 1895.〔Knight WC. 1895 A new Jurassic plesiosaur from Wyoming. ''Science'' 2: 449.〕 The species named as ''Megalneusaurus rex'' (meaning "great swimming lizard King") in 1898.〔Knight WC. 1898. Some new Jurassic vertebrates from Wyoming. ''American Journal of Science'' 4: 378-381.〕 However some of this material has since been lost, although new material has been discovered from the same site.〔Wahl WR, Ross M, Massare JA. 2007. Rediscovery of Wilbur Knight’s ''Megalneusaurus rex'' site: new material from an old pit. ''Paludicola'' 6 (2): 94-104.〕 Based upon the bones very large size, it appears to have grown to a size comparable to ''Liopleurodon''. Material from southern Alaska have been referred to ''Megalneusaurus'', although this material is from an individual of much smaller size.〔Weems RE, Blodgett RB. 1996. The pliosaurid ''Megalneusaurus'': a newly recognized occurrence in the Upper Jurassic Neknek Formation of the Alaska Peninsula. ''U.S. Geological Survey Bulletin'' 2152: 169-175.〕 ==See also== * List of plesiosaur genera * Timeline of plesiosaur research 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「Megalneusaurus」の詳細全文を読む スポンサード リンク
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