New material of the large-bodied caenagnathid Caenagnathus collinsi from the Dinosaur Park Formation of Alberta,Canada |
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| Institution: | 1. Division of Science and Resource Management, Big Bend National Park, TX 79834, United States;2. Department of Geosciences, Texas Tech University, Lubbock, TX 79409, United States;2. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xi-Zhi-Men-Wai Street, Beijing 100044, China;3. Department of Biological Sciences, The George Washington University, Washington, DC 20052, USA;4. CNRS UMR 5276, Université Claude Bernard Lyon 1 and Ecole Normale Supérieure de Lyon, Villeurbanne Cedex 69622, France;5. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Bei-Tu-Cheng-Xi Road, Beijing 100029, China;6. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai 201204, China;1. Museu de Ciências Naturais, Universidade Luterana do Brasil, Canoas-RS 92425-900, Brazil;2. Departamento de Geologia e Paleontologia, Museu Nacional-UFRJ, Rio de Janeiro-RJ 20940-040, Brazil;3. Centro de Apoio à Pesquisa Paleontológica, Universidade Federal de Santa Maria, Santa Maria-RS 97105-900, Brazil;4. Ludwig-Maximilians-Universität and Bayerische Staatssammlung für Paläontologie und Geologie, Munich 80333, Germany;5. Laboratório de Paleontologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto-SP 14040-901, Brazil;6. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK;7. Departamento de Geologia, Universidade Federal de Minas Gerais, Belo Horizonte-MG 31270-901, Brazil;8. Instituto Federal de Educação Ciência e Tecnologia Catarinense, Concórdia-SC 89700-000, Brazil;9. Centro Universitário La Salle, Canoas-RS 92010-000, Brazil;1. Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;2. Posgrado en Ciencias de la Tierra, Instituto de Geología, Universidad Nacional, Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;3. Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A OE8, Canada;4. Posgrado en Ciencias Biológicas, Instituto de Geología, Universidad Nacional, Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;5. Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apartado Postal 1039, 83000 Hermosillo, Sonora, Mexico;1. Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA 90007, USA;2. Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Strasse 10, D-80333 Munich, Germany;1. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9, Canada;2. Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, T0J 0Y0, Canada;3. Departamento de Ciencias Humanas, Universidad de La Rioja, 26004, Logroño, La Rioja, Spain |
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| Abstract: | A reexamination of large caenagnathid material from the Upper Cretaceous (Campanian) Dinosaur Park Formation of Alberta, Canada, reveals undescribed material referable to Caenagnathus collinsi. A femur, two astragalocalcanei, two metatarsals, two unguals, and a caudal vertebra provide anatomical information on Caenagnathus collinsi. Estimates of femoral length based on the proportions of other oviraptorids suggest that the non-femoral material represents a taxon intermediate in size between Chirostenotes pergracilis from the Dinosaur Park Formation and Anzu wyliei from the Maastrichtian Hell Creek Formation. The femur is within the range of predictions, and confirms the body size estimates based on the other material. The large size of the material and a number of morphological characters distinguish the material from Chirostenotes pergracilis and suggest that it is referable to Caenagnathus collinsi. The relative diversity of caenagnathids in the Dinosaur Park Formation is likely underestimated. |
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| Keywords: | Caenagnathidae Oviraptorosauria Theropoda Dinosaur Park Formation Body size |
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