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a genus of extinct reptiles of the suborder Theropoda, superorder Dinosauria. The animals had a large, rough protuberance on the nasal bones that was apparently the base of a horn. The single known species, C. nasicornis, was a large biped predator that measured approximately 3 m in height. A skeleton of the creature was found in Upper Jurassic deposits in the USA, in the state of Colorado.