A New Chasmosaurine (Ceratopsidae, Dinosauria) from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico

摘要

Ojoceratops fowleri, a new genus and species of chasmosaurine ceratopsid from the lower Maastrichtian Naashoibito Member (Ojo Alamo Formation), San Juan Basin, New Mexico, is diagnosed by an apomorphic squamosal. Ojoceratops fowleri is presently the only diagnosable ceratopsid from the Ojo Alamo Formation and antedates Eotriceratops xerinsularis, Triceratops horridus, Diceratops hatcheri, and Torosaurus latus, and is a temporal equivalent of "Torosaurus" utahensis.