Diabloceratops

Diabloceratops is an extinct genus of centrosaurine ceratopsian dinosaur that roamed the Earth approximately 81.4 to 81 million years ago, during the latter part of the Cretaceous Period. Its fossils have been discovered in what is now Utah, United States. Diabloceratops was a medium-sized, moderately built dinosaur that moved on four legs and was a herbivore. It could reach an estimated length of 4.5 meters (15 feet) and a body mass of 1.3 metric tons (1.4 short tons).

Discovery and Naming

The only known specimen of Diabloceratops eatoni was recovered from the Last Chance Creek Member of the Wahweap Formation in Kane County, Utah. The type specimen was collected in 2002. The dinosaur was formally named and described in 2010 by James Ian Kirkland and Donald DeBlieux. The generic name, Diabloceratops, translates to "devil-horned face," referencing its distinctive cranial features. The specific name, eatoni, honors paleontologist Jeffrey Eaton, who played a significant role in the establishment of the Grand Staircase-Escalante National Monument where the specimen was found.

Physical Characteristics

Diabloceratops possessed a large neck frill made of bone. It featured a small horn on its nose, potentially a second horn in front of that, and a pair of relatively small horns situated above its eyes. Notably, its skull was deeper and shorter than those of other centrosaurines. The frill also bore a pair of very long spikes, reminiscent of those found on genera like Einiosaurus and Styracosaurus. As one of the earlier centrosaurine ceratopsids, Diabloceratops shared a characteristic with more primitive protoceratopsid forms: an accessory opening in the skull that became reduced or disappeared in later ceratopsids, suggesting a gradual evolutionary sequence.

Paleoenvironment

Diabloceratops inhabited an environment characterized by lakes, floodplains, and east-flowing rivers. This region experienced a wet, seasonal climate. During its time, the Western Interior Seaway was at its widest extent, nearly isolating southern Laramidia from the rest of North America. Diabloceratops shared its habitat with a diverse array of fauna, including other dinosaurs like the hadrosaur Acristavus gagslarsoni and the theropod Lythronax argestes, which was likely the apex predator. The fauna also included freshwater fish, rays, sharks, turtles, crocodilians, lungfish, and various mammals.