[D] Kosmoceratops richardsoni [sG] [T]
Sampson, Loewen, Farke, Roberts, Forster, Smith & Titus 2010
Cretaceous Late Campanian
Ornithischia Genasauria Cerapoda Marginocephalia Ceratopia Neoceratopia Ceratopidae Chasmosaurinae
Kaiparowits Formation, southern Utah, US
The holotypic specimen is UMNH VP 17000, a nearly complete skull.
The generic name refers to kosmos (Greek), meaning ornamented, and ceratops (Greek), meaning horned face. The specific name honors Scott Richardson, who discovered the holotype and many other ignificant fossils from GSENM.
Type Locality, Horizon and Age.
The holotype and assigned specimens occur in the upper portion of the lower unit and lower portion of the middle unit of the late Campanian Kaiparowits Formation, GSENM, southern Utah, USA.
Referred specimens of Kosmoceratops richardsoni consist of: UMNH VP 12198, a disarticulated skull of a subadult individual.
Chasmosaurine ceratopsid diagnosed by the following autapomorphies: internal naris rostrocaudally abbreviated and caudodorsally inclined; nasal horncore transversely constricted, long-based, and blade-ike, with flattened distal portion; supraorbital horncores dorsolaterally directed proximally, with a ventral curvature distally tapering to a point; parietosquamosal frill relatively short and broad (maximum width ,2 times maximum length), with small, caudally positioned parietal fenestrae; parietosquamosal frill with ten well developed processes on caudal margin composed on each side of three procurved epiparietals (ep1-3), one procurved process on the parietosquamosal contact (esp), and one laterally to rostrolaterally directed episquamosal (es1).