The cranial morphology and taxonomic status of Tarchia (Dinosauria: Ankylosauridae) from the Upper Cretaceous of Mongolia |
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| Institution: | 1. The Geology Museum, 1215 W. Dayton St., Madison, WI 53706, USA;2. Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ul. 123, Moscow 117997, Russia;1. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina;2. CONICET: Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;3. Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Av. Las Palmeras, 3425, Santiago, Chile;4. Canterbury Museum, Rolleston Avenue, Christchurch, 8013, New Zealand;5. Department of Paleontology GNS Science, P.O.Box 30368, Lower Hutt, 5040 Courier, 1 Fairway Drive, Avalon, Lower Hutt, New Zealand;1. Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina;2. Fundación de Historia Natural “Félix de Azara”, Universidad Maimónides, V. Virasoro 732, 1405 Buenos Aires, Argentina;3. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;4. Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina;1. Zoological Institute, Russian Academy of Sciences, Universitetskaya nab. 1, 199034 Saint Petersburg, Russia;2. Department of Sedimentary Geology, Geological Faculty, Saint Petersburg State University, 16 Liniya VO 29, 199178 Saint Petersburg, Russia;3. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, MRC 121, P.O. Box 37012, Washington, DC 20013-7012, USA;1. New Mexico Museum of Natural History and Science, 1801 Mountain Road, NW, Albuquerque, NM 87104, USA;2. School of GeoSciences, University of Edinburgh, Grant Institute, James Hutton Road, Edinburgh EH9 3FE, Scotland, UK;1. Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115, Berlin, Germany;2. Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Senda del Rey 9, 28040, Madrid, Spain;3. Unidad de Paleontología, Departamento de Biología, Universidad Autónoma de Madrid, Calle Darwin 2, 20049, Madrid, Spain;4. Facultad de Bellas Artes, Universidad Complutense de Madrid, Calle Pintor el Greco 2, 28040, Madrid, Spain |
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| Abstract: | The taxonomic status of specimens referred to Tarchia kielanae, T. gigantea, and Minotaurasaurus ramachandrani has been contested. The holotype of T. kielanae, Zaklad Paleobiologii (Institute of Paleobiology)-Polish Academy of Sciences (ZPAL) MgD I/111, is redescribed. It has features common to both Palaeontological Institute-Russian Academy of Sciences (PIN) 3142/250, long considered Tarchia, and to M. ramachandrani but which are lacking in Saichania chulsanensis. The specimen PIN 3142/250 is not referable to Saichania but instead represents a new species, Tarchia teresae sp. nov. Similarly, the holotype skull of M. ramachandrani is not referable to T. kielanae, so Minotaurasaurus is a valid taxon. Tarchia is more derived than either Saichania or Minotaurasaurus while sharing features of both. |
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| Keywords: | Ankylosauridae Dinosauria Cretaceous |
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