Evolution and Diversity of Ornithomimid Dinosaurs in the Upper Cretaceous Belly River Group of Alberta

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  • Ornithomimids from the Upper Cretaceous Belly River Group are among the best known theropods from these deposits, but questions remain concerning the oldest definitive occurrence of these dinosaurs in Alberta, as well as the taxonomic diversity of the articulated material. A partial skeleton is described and removed from Struthiomimus altus as the holotype of a new taxon. At least three ornithomimid taxa were roughly contemporaneous in the lower Dinosaur Park Formation. A reevaluation of isolated elements rejects reports of this clade from the Santonian Milk River Formation. The oldest Albertan material definitively referable to Ornithomimidae is from the lower Oldman Formation, and it is proposed that derived ornithomimids migrated into Laramidia during the Campanian. Characters considered diagnostic of the Chinese taxon Qiupalong are reported in material from the Belly River Group, supporting a close relationship between Asian and Albertan ornithomimids, and possibly a more complex palaeobiogeographic history than previously hypothesized.

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  • Copyright © 2015 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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  • 2015


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