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.
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