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Simoedosaurus : ウィキペディア英語版 | Simoedosaurus
''Simoedosaurus'' is an extinct reptile known from the Paleocene of North America, Europe and western Asia,〔A. O. Averianov. 2005. The first choristoderes (Diapsida, Choristodera) from the Paleogene of Asia. Palaeontological Journal 39(1):79-84〕 and a member of the Choristodera, a group of aquatic reptiles that lived in the Northern Hemisphere from the Jurassic to the early Cenozoic. ==Phylogenetics==
Though similar to and conspecific, ''Simoedosaurus'' is not closely related to the North American ''Champsosaurus'', instead it appears to be most closely related to ''Tchoiria'' and ''Ikechosaurus'' from the Early Cretaceous of Asia. It therefore may represent a species that immigrated into North America from Asia in the wake of the Cretaceous-Tertiary mass extinction event, though the absence of choristoderes in the Late Cretaceous of Asia makes this merely a paleogeographical speculation.〔R. Matsumoto and S. E. Evans. 2010. Choristoderes and the freshwater assemblages of Laurasia. Journal of Iberian Geology 36(2):253-274〕
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