Coahuilaceratops

Coahuilaceratops (meaning "Coahuila horn face") is a genus of herbivorous ceratopsian dinosaur. It is a chasmosaurine ceratopsian which lived during the Late Cretaceous period (late Campanian stage) in what is now southern Coahuila in northern Mexico. It is known from the holotype CPC 276, a partial skeleton of an adult individual which includes several skull elements. Another specimen, CPS 277, may represent a juvenile "Coahuilaceratops". All specimens of "Coahuilaceratops" were collected from a single location in the middle strata of the Cerro del Pueblo Formation, which dates to between 72.5 and 71.4 million years ago.
It was formally described in 2010, though it appeared as an informal designation ("nomen nudum") as early as 2008. "Coahuilaceratops" was named by Mark A. Loewen, Scott D. Sampson, Eric K. Lund, Andrew A. Farke, Martha C. Aguillón-Martínez, C.A. de Leon, R.A. Rodríguez-de la Rosa, Michael A. Getty and David A. Eberth in 2010 and the type species is "Coahuilaceratops magnacuerna". Although based on incomplete remains, "Coahuilaceratops" is thought to possess among the largest horns of any dinosaur currently known, rivaling in absolute size those of larger chasmosaurines like "Triceratops" and "Torosaurus". Its horns are estimated to have been up to 1.2 m (4 feet) long. In 2012 Thomas Hotlz gave a length of 8 meters (26 ft).
Systematics.
"Coahuilaceratops" is a member of the Chasmosaurinae. Below is a cladogram that represents the findings of Caleb Brown and Donald Henderson (2015). "Coahuilaceratops" and "Bravoceratops" were resolved as sister taxa yet in a recent analysis by Mallon et al. "Bravoceratops" was removed from the Chasmosaurinae entirely because it decreased resolution in the authors' analysis.