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Dentaries of a caenagnathid (Dinosauria: Theropoda) from the Nemegt Formation of the Gobi Desert in Mongolia
Institution:1. Dinosaur Trackers Research Group, University of Colorado Denver, Denver, CO 80217, USA;2. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China;3. Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan;4. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;5. Beijing Museum of Natural History, Beijing, China;6. Shandong Provincial No.4 Institute of Geological and Mineral Resources, Weifang 261021, China;7. Institute of Vertebrate Paleontology and Paleoanthropology, Beijing, China
Abstract:A symphyseal region of the fused dentaries of a caenagnathid theropod is described from the Upper Cretaceous Nemegt Formation at the Bugin Tsav locality in the Mongolian Gobi Desert. In contrast to the high diversity of Caenagnathidae in the upper Campanian to Maastrichtian in North America, only specimens of a single caenagnathid, Elmisaurus raurus, have been reported in the coeval strata in Asia. Although dentaries are commonly-found bones in the fossil record of Caenagnathidae, the present specimen is the first discovery of caenagnathid dentaries from the upper Campanian to Maastrichtian in Asia. The Nemegt Formation is unique for its diverse oviraptorosaurian fauna that includes both Caenagnathidae and Oviraptoridae as well as the non-caenagnathoid Avimimus portentosus. Hypothesized coexistence of eolian and fluvial environments in the Gobi Basin during the deposition of the Nemegt Formation might explain such co-occurrence of Caenagnathidae and Oviraptoridae.
Keywords:Dinosauria  Theropoda  Caenagnathidae  Oviraptorosauria  Upper Cretaceous
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