The well preserved material of the Late Cretaceous dromaeosaurid, Velociraptor mongoliensis, has allowed us to supplement earlier descriptions of the skull in this species. The skull of V. mongoliensis is similar to that of Deinonychus antirrhopus, but differs from the latter by: (1) laterally convex supratemporal arcade resulting in short, rounded supratemporal fenestra; (2) depressed nasal; (3) longer maxillary process of premaxilla; (4) lack of separate prefrontal, and (5) convex ventral border of the dentary. These differences, especially that in the structure of the temporal region, support generic distinction of Deinonychus and Velociraptor. Skulls of other dromaeosaurids are compared.
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