†Yinlong Xu et al. 2006 (ornithischian)
Full reference: X. Xu, C. A. Forster, J. M. Clark and J. Mo. 2006. A basal ceratopsian with transitional features from the Late Jurassic of northwestern China. Proceedings of the Royal Society of London B 273:2135-2140
Parent taxon: Ceratopsia according to F.-L. Han et al. 2012
Sister taxa: Albalophosaurus, Chaoyangosauridae, Chaoyangsauridae, Chaoyangsaurus, Eoceratopsinae, Ligabueichnium, Micropachycephalosaurus, Neoceratopsia, Psittacosauridae, Psittacosauroidea, Stenopelix
Subtaxa: Yinlong downsi
Ecology: ground dwelling herbivore