Ceratops (meaning "horn face") was a ceratopsian dinosaur which lived during the Late Cretaceous. Its fossils have been found in Montana and Alberta, Canada. Although poorly known, Ceratops is important in the history of dinosaurs, since it is the type species upon which both Ceratopsia and Ceratopsidae are based. Unfortunately, the material is too poor to be diagnostic and Ceratops is considered a nomen dubium. More complete material recently found in Colorado may enable Ceratops to be reexamined (Trexler & Sweeney, 1995).