Coahuilaceratops
Introduction '''''Coahuilaceratops''''' (meaning "Coahuila horn face") is a genus of 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.Restoration. 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 León, 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. It was a medium-sized ceratopsian, reaching  in length and  in body mass.
Systematics ''Coahuilaceratops'' is a member of the Chasmosaurinae. Below is a cladogram that represents the findings of Caleb Brown and Donald Henderson (2015), finding ''Coahuilaceratops'' to be the sister taxon to the Texan ''Bravoceratops''. This pairing was replicated by Jordan Mallon ''et al.'' in 2016, although ''Bravoceratops'' had to be cut from the analysis to create meaningful results. In 2021, ''Sierraceratops'' was described and found to clade with ''Coahuilaceratops'' and ''Bravoceratops'', and its describers, Sebastian Dalman ''et al. '', suggest they all form a clade unique to southern Laramidia.
See also * Timeline of ceratopsian research
References