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Nasutoceratops
''Nasutoceratops'' is an extinct genus of ceratopsian dinosaur. It is a basal centrosaurine which lived during the late Cretaceous period (late Campanian, about 76.0-75.5 Ma) in what is now southern Utah, USA. ''Nasutoceratops'' was a large, ground-dwelling, quadrupedal herbivore with a short-snout and unique rounded horns above its eyes that have been likened to those of modern cattle. Extending almost to the tip of its snout, these horns are the longest of all the members of the centrosaurine subfamily. The presence of pneumatic elements in the nasal bones of ''Nasutoceratops'' are a unique trait and are unknown in any other ceratopsid. ''Nasutoceratops'' and ''Diabloceratops'' are the only two centrosaurine dinosaurs from the American southwest.
==Discovery==
''Nasutoceratops'' is known from the holotype UMNH VP 16800, a partially associated nearly complete skull, a coronoid process, a syncervical, three partial anterior dorsal vertebrae, a shoulder girdle, an associated left forelimb, parts of the right forelimb and skin impressions. Two specimens were referred: UMNH VP 19466, a disarticulated adult skull consisting of an incomplete premaxilla, maxilla and nasal, and UMNH VP 19469, an isolated squamosal of a subadult. The holotype was discovered and collected in 2006 during the Kaiparowits Basin Project, initiated by the University of Utah in 2000. It was recovered from channel sandstone from the middle unit of the upper Kaiparowits Formation within the Grand Staircase-Escalante National Monument, in sediment that dates to the late Campanian stage of the Cretaceous period, approximately 75 million years ago.〔M. A. Getty, M. A. Loewen, E. M. Roberts, A. L. Titus, and S. D. Sampson. 2010. Taphonomy of horned dinosaurs (Ornithischia: Ceratopsidae) from the late Campanian Kaiparowits Formation, Grand Staircase-Escalante National Monument, Utah. In M. J. Ryan, B. J. Chinnery-Allgeier, D. A. Eberth (eds.), New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Indiana University Press, Bloomington 478-494〕 It was first named and described in a thesis by its discoverer Eric Karl Lund in 2010 as ''Nasutuceratops titusi'', remaining at first an invalid ''nomen ex dissertatione''. Scott D. Sampson, Lund, Mark A. Loewen, Andrew A. Farke and Katherine E. Clayton validly named it in 2013, emending the generic name to ''Nasutoceratops''. The type species is ''Nasutoceratops titusi''. The generic name comes from ''nasutus'' in Latin meaning "large-nosed", and ''ceratops'', "horned-face" in Greek. The specific name honors Alan L. Titus for recovering fossils of ''Nasutoceratops'' from the GSENM.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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