Abstract

The discovery of a fused tarsometatarsus in the Upper Cretaceous (Campanian) strata of Dinosaur Provincial Park shows that Elmisaurus, previously known only from Mongolia, also lived in North America. Reexamination of the type specimen of "Ornithomimus" elegans (Parks 1933) confirms the identification and provides a species name. Elmisaurus elegans is more gracile than Elmisaurus rarus, has a weaker longitudinal ridge on the fourth metatarsal, and has a pair of distal processes on metatarsals II and IV. Although six theropod families had representatives in both North America and Asia during Cretaceous times, the degree of genetic similarity is poorly understood. Analysis of the Elmisaurus material suggests that faunal interchange was still underway during the Late Cretaceous.

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