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      A dromaeosaurid dinosaur with a filamentous integument from the Yixian Formation of China

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      Nature
      Springer Nature

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          The theropod ancestry of birds: new evidence from the late cretaceous of madagascar

          A partial skeleton of a primitive bird, Rahona ostromi, gen. et sp. nov., has been discovered from the Late Cretaceous of Madagascar. This specimen, although exhibiting avian features such as a reversed hallux and ulnar papillae, retains characteristics that indicate a theropod ancestry, including a pubic foot and hyposphene-hypantra vertebral articulations. Rahona has a robust, hyperextendible second digit on the hind foot that terminates in a sicklelike claw, a unique characteristic of the theropod groups Troodontidae and Dromaeosauridae. A phylogenetic analysis places Rahona with Archaeopteryx, making Rahona one of the most primitive birds yet discovered.
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            Archaeopteryx and the origin of birds

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              An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China

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                Author and article information

                Journal
                Nature
                Nature
                Springer Nature
                0028-0836
                1476-4687
                September 1999
                September 16 1999
                : 401
                : 6750
                : 262-266
                Article
                10.1038/45769
                8d7aeadb-8ce9-4eec-9b42-fde88df5f9d5
                © 1999

                http://www.springer.com/tdm

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