ceratopsid

The third group, Ceratopsidae, had very large frills and horns on the nose and above the eyes. Ceratopsidae is made up of two lineages: the Chasmosaurinae had large eye horns and small nose horns, and the Centrosaurinae had small eye horns and large nose horns. Chasmosaurinae includes Triceratops…

The first ceratopsian (“horn-faced”) dinosaur remains were found in the 1870s by the American paleontologist Edward D. Cope, who named the animal Agathaumus, but the material was so fragmentary that its unusual design was not at once recognized. The first inkling that there had…