A New Eutherian Mammal from the Upper Cretaceous Bayinshire Formation of MongoliaCitation for this article: Lopatin, A. V. & Averianov, A. O. (2023) A new eutherian mammal from the Upper Cretaceous Bayinshire Formation of Mongolia. Journal of Vertebrate Paleontology . https://doi.org/10.1080/02724634.2023.2281478

ABSTRACTBayshinoryctes shuvalovi gen. et sp. nov. is based on a fragmentary skull including right maxilla associated with right and left dentaries with partially preserved dentition from the Upper Cretaceous (Turonian–Santonian) Bayinshire Formation at Bayshin Tsav locality in Gobi Desert, Mongolia. Undated Bayesian analyses of two different data matrices recover the new taxon as a stem placental mammal within the clade containing also Maelestes from the Upper Cretaceous (Campanian) of Mongolia and Batodon from the Upper Cretaceous (Maastrichtian) of North America. Bayshinoryctes gen. nov. differs from Maelestes by a few dental characters, including three-rooted P4, double-rooted p3, and p5 with metaconid swelling. ACKNOWLEDGMENTSWe thank Nao Kusuhashi and Simone Hoffmann for reviewing the paper. This work was supported by the Russian Science Foundation (project 19-14-00020-P), the Borissiak Paleontological Institute of the Russian Academy of Sciences, and the Zoological Institute, Russian Academy of Sciences (project 122031100282-2).SUPPLEMENTARY FILESSupplementary File 1.nex: Bayshinoryctes1.nexSupplementary File 2.nex: Bayshinoryctes2.nexSupplementary File 3.tnt: Bayshinoryctes3.tnt, data matrices for the phylogenetic analysis.Additional informationNotes on contributorsAlexey V. LopatinAVL and AOA: conceptualization, anatomical description, writing—original draft, review and editing; AVL: data curation, CT scanning; AOA: CT data segmentation, phylogenetic analysis, figures preparation, funding acquisition. All authors edited, reviewed, and gave final approval for publication.Alexander O. AverianovAVL and AOA: conceptualization, anatomical description, writing—original draft, review and editing; AVL: data curation, CT scanning; AOA: CT data segmentation, phylogenetic analysis, figures preparation, funding acquisition. All authors edited, reviewed, and gave final approval for publication.