A possible juvenile ceratopsoid ilium from the Cenomanian of central Utah,U.S.A. |
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| Affiliation: | 1. Prehistoric Museum, Utah State University Eastern, Price, UT 84501, USA;2. University of Colorado Museum, Boulder, CO 80309, USA;3. Oklahoma Museum of Natural History, Norman, OK 73072, USA;1. Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36, Uppsala, Sweden;2. Australian Age of Dinosaurs Natural History Museum, The Jump-Up, Winton, Queensland, 4735, Australia;3. Monash University, Wellington Road, Clayton, Victoria, 3800, Australia;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. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;1. Borissiak Paleontological Institute of the Russian Academy of Sciences, Profsoyuznaya 123, 117737 Moscow, Russia;2. Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia;3. Department of Sedimentary Geology, Geological Faculty, Saint Petersburg State University, 16 liniya VO 29, 199178 Saint Petersburg, Russia;4. Department of Historical Geology and Paleontology, Geological Faculty, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia;5. Institute of Geology and Petroleum Technology, Kazan Federal University, Kremlevskaya Str. 4/5, 420008 Kazan, Russia;1. Department of Earth Sciences, Montana State University, Bozeman, MT, 59717, USA;2. Zhejiang Museum of Natural History, Hangzhou, Zhejiang 310014, People''s Republic of China;3. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, People''s Republic of China;4. CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, People''s Republic of China;5. University of Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;6. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, People''s Republic of China;7. Fukui Prefectural Dinosaur Museum, Katsuyama, Fukui, 911-8601, Japan;8. Institute of Dinosaur Research, Fukui Prefectural University, Eiheiji, Fukui 910-1195, Japan;9. Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa 920-1192, Japan;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. CONICET, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Isidro Lobo 516, 8332 General Roca, Argentina |
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| Abstract: | We describe a small ilium, with fibrous texture characteristic of juvenile bone, from the lower Cenomanian of central Utah, U.S.A. The ilium was recovered from the upper part of the Mussentuchit Member of the Cedar Mountain Formation. The ilium most closely resembles that of immature ceratopsid ilia referred to Agujaceratops mariscalensis from the Campanian Aguja Formation of southern Texas, U.S.A. Both have everted dorsal margins over the iliac body, subhorizontal postacetabular processes, and laterally compressed, anteroventrally curved preacetabular processes. If correctly identified, the small ilium from the Cedar Mountain Formation is the oldest ceratopsid or ceratopsoid known, and shows that the diversity of early ceratopsians was greater than previously realized. |
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| Keywords: | Ceratopsoidea Cenomanian Cedar Mountain Formation |
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