Sympatry of two ankylosaurs (Hungarosaurus and cf. Struthiosaurus) in the Santonian of Hungary |
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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 Earth Sciences, Stellenbosch University, Private Bag X1 Matieland, Stellenbosch 7602, South Africa;2. Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, United States;3. Department of Biological Sciences, Campus Box 7617, North Carolina State University, Raleigh, NC 27695, USA;4. Natural and Environmental Sciences, Western Colorado University, 1 Western Way, Gunnison, CO, 81231, USA;5. Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia;6. School of Geotechnology, Institute of Engineering, Suranaree University of Technology, 111 University Avenue, Nakhon Ratchasima 30000, Thailand;7. Sirindhorn Museum, Department of Mineral Resources, 200 Moo 11, Kalasin 46140, Thailand;8. Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road, Chatuchak, Bangkok 10900, Thailand;9. Paleontology, North Carolina Museum of Natural Sciences, 11 W. Jones St., Raleigh, NC 2.7601, USA |
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| Abstract: | A complete and well-preserved right ankylosaurian humerus from the Upper Cretaceous (Santonian) Csehbánya Formation of Iharkút, western Hungary is described here. Based on its osteological features and 21.5 cm adult length, the new specimen is markedly different from the slender humerus of Hungarosaurus, the previously known ankylosaur from the locality, and more similar to that of Struthiosaurus. Thus, the new Hungarian specimen is tentatively assigned here to cf. Struthiosaurus thereby dating back the first occurrence of this genus to the Santonian. The new fossil demonstrates the sympatric co-existence of two different nodosaurid ankylosaurs (a smaller, robust form with 2–2.5 m total body length and a larger, cursorial form with 4–4.5 m body length) in the Iharkút fauna. This also suggests that the pattern of the European ankylosaur diversity was more complex than previously thought. |
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| Keywords: | Co-existence Late Cretaceous Hungary |
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