Tail anatomy of Buitreraptor gonzalezorum (Theropoda,Unenlagiidae) and comparisons with other basal paravians |
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| Institution: | 1. Instituto de Investigaciones en Biodiversidad y Medioambiente, CONICET - Universidad Nacional del Comahue, San Carlos de Bariloche 8400, Argentina;2. School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, South Korea;3. Hokkaido University Museum, Hokkaido University, Sapporo 060-0810, Japan;4. Geological Museum, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, South Korea;5. Department of Biological Sciences, University of Alberta, Edmonton T6G 2E9, Canada;1. Department of Biological Sciences, CW 405 Biological Sciences Building, University of Alberta, Edmonton, AB T6G 2E9, Canada;2. Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB T6G 2E3, Canada;3. Institute of Paleontology and Geology, Mongolian Academy of Sciences, Box-46/650, Ulaanbaatar 15160, Mongolia |
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| Abstract: | Tail anatomy of unenlagiid theropods remains poorly known. The most complete and informative taxon of this family is Buitreraptor gonzalezorum from the Upper Cretaceous of Rio Negro province, Argentina. The aim of the present contribution is to carry out an analysis of the tail anatomy of Buitreraptor based on its holotype and a newly collected specimen as well. Similarities shared by Buitreraptor, Rahonavis, Anchiornis and Archaeopteryx include: mid-caudal vertebrae with postzygapophyses longer than prezygapophyses, and mid-caudal centra with a system of lateral laminae and concavities. Preservation of paravian skeletons, as well as muscular reconstruction, indicate the presence of two different functional sections of the tail. This contribution sheds light on paravian tail evolution and provides new data on tail changes that occurred along the theropod line towards modern birds. |
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| Keywords: | Theropoda Paraves Unenlagiidae Tail |
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