Abstract
A nearly complete and articulated dinosaur skeleton from the Upper Cretaceous (Cenomanian–Santonian) Bayinshire Formation at Bayshin Tsav locality in Gobi Desert (Mongolia) represents a juvenile hadrosauroid. This specimen is clustered with Gobihadros mongoliensis from the same formation and locality on 68% of the 304 most parsimonious trees produced by PAUP analysis. However, it is clearly different from Gobihadros by more derived dentition demonstrated by reduced marginal denticles and lack of accessory ridges on the tooth crown. The juvenile specimen additionally differs from Gobihadros by a triangular rostral process of parietals wedged between the frontals and much shorter postorbital process of jugal. This specimen may represent a second, previously unknown taxon of the Hadrosauroidea in the Bayinshire Formation.
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ACKNOWLEDGMENTS
We are grateful to A.M. Kuznetsov, A.A. Karhu, K.K. Tarasenko, E.V. Rozhnov, and A.G. Vlasov (PIN) for organizational and technical assistance during this study and S.V. Bagirov (PIN) for help in preparing the photographs of the specimen PIN, no. 3458/5.
Funding
This work was supported by the grant in the field of science in the form of subsidies from the federal budget to ensure the conduct of scientific research by Russian scientific organizations and (or) educational institutions of higher education together with organizations of the CIS countries and Mongolia, as part of the implementation of the program of bilateral and multilateral scientific and technological cooperation (State Contract no. 13.2251.21.0029, project “Higher vertebrates of the Late Mesozoic and Cenozoic of Mongolia”).
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Averianov, A.O., Lopatin, A.V. & Tsogtbaatar, K. Taxonomic Attribution of a Juvenile Hadrosauroid Dinosaur from the Upper Cretaceous Bayinshire Formation of Mongolia. Dokl. Earth Sc. 503, 93–96 (2022). https://doi.org/10.1134/S1028334X22030035
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DOI: https://doi.org/10.1134/S1028334X22030035