It was a small centrosaurine with a body length of 3 metres (9.8 ft), 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.

Specimens of Yehuecauhceratops were recovered during excavations from 2007 to 2011 in a locality near the town of La Salada, in Ocampo, Coahuila, Mexico,[1] about 23.3 kilometres (14.5 mi) south of Big Bend National Park in Texas.

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").

Unlike more derived centrosaurines like Styracosaurus, Centrosaurus, and Pachyrhinosaurus,[4] but more similarly to Avaceratops,[5] the squamosal is longer than it is wide.

These two characteristics, the position of the ridge and the single protuberance, are the autapomorphies of Yehuecauhceratops, traits allowing it to be distinguished from other centrosaurines.

The largest and most thickened pieces, which originate from near the centre of the frill, suggest that Yehuecauhceratops probably had relatively small fenestrae, in contrast to most other centrosaurines but not to Avaceratops.

[5] A parietal epiossification is preserved; it has a simple, crescent-shaped edge, not unlike the squamosal undulations in terms of its shape, and its surface is roughened.

Additionally, the specimen UMNH VP16704, referred to as the "Nipple Butte skull", also resembles Yehuecauhceratops and Menefeeceratops in having a fan-shaped end of the squamosal, though it lacks this singular protrusion.

[2] From contemporaneous deposits of the Aguja Formation in Texas, numerous dinosaurs are known; they include the chasmosaurine Agujaceratops mariscalensis, the saurolophine Kritosaurus, the pachycephalosaur Texacephale, and the tooth taxon Richardoestesia, as well as unnamed lambeosaurines, nodosaurs, tyrannosaurs, ornithomimids, caenagnathids, and dromaeosaurs.

[13] Non-dinosaurs include the giant alligatoroid Deinosuchus[13][14] and a goniopholidid; the squamates Odaxosaurus, Proxestops, Restes, Sauriscus, and various unnamed taxa; the turtles "Baena" and "Aspideretes", as well as an additional chelonian; the amphibians Albanerpeton, a scapherpetonid, a salamander, and a frog; the mammals Cimolomys, Meniscoessus, Cimolodon, Alphadon, Turgidodon, Pediomys, Gallolestes, and others; various bony fish; and the cartilaginous fish Hybodus, Lissodus, Scapanorhynchys, Onchopristis, Ischyrhiza, Squatirhina, Ptychotrygon, and others.

[2] However, several chasmosaurines are also known from Mexico, namely Agujaceratops mavericus and Coahuilaceratops magnacuerna (from the Cerro de Pueblo Formation).

Within the Aguja fauna, Yehuecauhceratops was relatively small compared to the giant Coahuilaceratops, with Agujaceratops in between; this suggests some level of size-based diet partitioning among the three ceratopsids.