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Pantosaurus
・ Pantosperma holochalca
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Pantosaurus : ウィキペディア英語版
Pantosaurus

''Pantosaurus'' ("all lizard") is an extinct genus of plesiosaur from the Late Jurassic (Oxfordian) of what is now Wyoming. It lived in what used to be the Sundance Sea. It was originally named ''Parasaurus'' ("near lizard") by Othniel Charles Marsh in reference to ''Plesiosaurus'', but that name was preoccupied, and Marsh changed it. The species ''Muraenosaurus reedii'' is in fact a junior synonym of ''Pantosaurus''. The holotype YPM 543 is a partial articulated skeleton, partially prepared to yield a distal humerus, four articulated carpals, a fragment of the coracoid, and several isolated cervical vertebrae from the Upper Member of the Sundance Formation. Other material includes USNM 536963, USNM 536965, UW 3, UW 5544 and UW 15938.
==Palaeobiology==
''Pantosaurus'' possesses between 35 and 40 cervical vertebrae, which are very similar in proportion and morphology to those of ''Muraenosaurus leedsii'' from the Oxford Clay Formation (Callovian, Middle Jurassic) of England. The forelimb of ''Pantosaurus'' however can be differentiated from that of ''Muraenosaurus'', such as the relatively large size of the radius and the corresponding humerus-radius articulation. No ''Pantosaurus'' cranial material has yet been discovered.〔

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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