author={John Harold Ostrom},
  journal={Osteology of Deinonychus antirrhopus, an Unusual Theropod from the Lower Cretaceous of Montana},
  • J. H. Ostrom
  • Published 7 July 1969
  • Environmental Science, Biology
  • Osteology of Deinonychus antirrhopus, an Unusual Theropod from the Lower Cretaceous of Montana
Deinonychus antirrhopus, a new genus and species of theropod dinosaur is described from the Cloverly Formation (Lower Cretaceous) of southern Montana. The species is characterized by a highly specialized pes bearing a very large, trenchant claw on digit II, a highly raptorial manus with a very mobile carpus, and a specialized caudal series with extremely long prezygapophyseal and chevron rods. The new species is closely related to Dromaeosaunis albertemis, which features similar specialization… 

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