Yehuecauhceratops (meaning "ancient horned face") is a genus of horned centrosaurine ceratopsid dinosaur from the Late Cretaceous of Coahuila, Mexico. It contains a single species, Y. mudei, described from two partial specimens by Rivera-Sylva et al. in 2016 and formally named by Rivera-Sylva et al. in 2017. It was a small centrosaurine with a body length of , making it smaller than Agujaceratops and Coahuilaceratops, the other two ceratopsids in its environment; the three may have been ecologically segregated. A ridge bearing a single roughened projection near the bottom of the squamosal bone, which probably supported a small horn, allows Yehuecauhceratops to be distinguished from other centrosaurines. Its affinities to nasutoceratopsin centrosaurines, such as Avaceratops and Nasutoceratops, are supported by various morphological similarities to the former. Discovery and naming Specimens of Yehuecauhceratops were recovered during excavations from 2007 to 2011 in a locality near the town of La Salada, in Ocampo, Coahuila, Mexico, about south of Big Bend National Park in Texas. The rocks exposed in this locality belong to the Campanian Aguja Formation, although its precise location within the temporal range of the formation is difficult to establish. Specimens attributed to Yehuecauhceratops are stored in the palaeontological collection of the Museo del Desierto. The holotype of Yehuecauhceratops has been given the specimen number CPC 274. It consists of a nearly complete left squamosal, three fragments from the parietal, one fragment each from the premaxilla and dentary, a complete scapula and femur, the portion of the ilium in front of the acetabulum, and part of a dorsal vertebra with the neural spine broken off. Parts of the ribs, fragments of the ossified tendons that supported the tail, and miscellaneous fragments are also known. Additionally, there is a tibial fragment that is too small to belong to CPC 274; this second specimen, not referred in 2017, has been labelled with the specimen number CPC 1478. Although these two specimens were initially described by Rivera-Sylva et al. in 2016 as an indeterminate centrosaurine, they were formally named in 2017 by Héctor Eduardo Rivera-Sylva, Eberhard Frey, Wolfgang Stinnesbeck, José Rubén Guzmán-Gutiérrez and Arturo Homero González-González, based on the diagnostic characters in the squamosal. The generic name Yehuecauhceratops, pronounced "Ye-OO-ek-au-ceratops", is derived from the Nahuatl word yehuecauh ("ancient") and the Greek suffix ceratops ("horned face"). Meanwhile, the specific name mudei references the acronym of the Museo del Desierto (MUDE). Description Yehuecauhceratops was a small