Menefeeceratops

Menefeeceratops (meaning "Menefee Formation horned face") is a genus of ceratopsid dinosaur from the Menefee Formation in New Mexico, United States. It is potentially the oldest known member of the ceratopsids, as well as the centrosaurine subfamily, related to animals including Yehuecauhceratops and Crittendenceratops. The type and only species is Menefeeceratops sealeyi, known from a partial, non-articulated skeleton.

== Discovery and naming == left|thumb|Squamosal bone from the holotype of M. sealeyi The holotype, NMMNH P-25052, of Menefeeceratops was discovered by Paul Sealey in 1996 and later mentioned in a paper in 1997, but was not given a name until it was revisited in 2021 by Sebastian Dalman, Peter Dodson, and colleagues. The holotype was collected at the NMMNH locality 3033 in Sandoval County, New Mexico, USA, whose rocks came from the early Campanian rocks of the Allison Member of the Menefee Formation. The holotype was later collected by the New Mexico Museum of Natural History with permission of the Bureau of Land Management, who owned the land the fossils were found on, and consisted of a fragmentary skull, mandible, several fragmentary vertebrae, some ribs, the left ilium, and several fragmentary limb elements. Menefeeceratops is the only Centrosaurine described from New Mexico, while many Chasmosaurines such as Pentaceratops and Sierraceratops having been described from the late Campanian and Maastrichtian.