A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia
Yu, Congyu (American Museum of Natural History. Division of Vertebrate Paleontology)
Prieto-Marquez, Albert (Institut Català de Paleontologia Miquel Crusafont)
Chinzorig, Tsogtbaatar (Mongolian Academy of Sciences. Institute of Paleontology)
Badamkhatan, Zorigt (Montana State University. Department of Earth Sciences)
Norell, Mark (American Museum of Natural History. Division of Vertebrate Paleontology)

Data:	2020
Resum:	Ceratopsia is a diverse dinosaur clade from the Middle Jurassic to Late Cretaceous with early diversification in East Asia. However, the phylogeny of basal ceratopsians remains unclear. Here we report a new basal neoceratopsian dinosaur Beg tse based on a partial skull from Baruunbayan, Ömnögovi aimag, Mongolia. Beg is diagnosed by a unique combination of primitive and derived characters including a primitively deep premaxilla with four premaxillary teeth, a trapezoidal antorbital fossa with a poorly delineated anterior margin, very short dentary with an expanded and shallow groove on lateral surface, the derived presence of a robust jugal having a foramen on its anteromedial surface, and five equally spaced tubercles on the lateral ridge of the surangular. This is to our knowledge the earliest known occurrence of basal neoceratopsian in Mongolia, where this group was previously only known from Late Cretaceous strata. Phylogenetic analysis indicates that it is sister to all other neoceratopsian dinosaurs.
Ajuts:	Ministerio de Economía y Competitividad RyC-2015-17388 Ministerio de Ciencia e Innovación CGL2016-73230
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Palaeontology ; Phylogenetics
Publicat a:	Communications Biology, Vol. 3 (September 2020) , art. 499, ISSN 2399-3642

DOI: 10.1038/s42003-020-01222-7
PMID: 32913206

8 p, 991.9 KB

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