Ceratopsia was coined by Othniel Charles Marsh in 1890 to include dinosaurs possessing certain characteristic features , including horns , a rostral bone , teeth with two roots , fused neck vertebrae , and a forward @-@ oriented pubis . Marsh considered the group distincted enough to warrant its own suborder within Ornithischia . The name is derived from the Greek κερας / keras meaning ' horn ' and οψις / opsis meaning ' face ' . As early as the 1960s , it was noted that the name Ceratopsia is actually incorrect linguistically and that it should be Ceratopia . However , this spelling , while technically correct , have been used only rarely in the scientific literature , and the vast majority of paleontologists continue to use Ceratopsia . As the ICZN do not govern taxa above the level of superfamily , this is unlikely to change .