Regaliceratops

Regaliceratops (meaning "Royal horned face") is a monospecific genus of chasmosaurine ceratopsid dinosaur from Alberta, Canada that lived during the Late Cretaceous (middle Maastrichtian stage, 68.5 to 67.5 Ma) in what is now the St. Mary River Formation. The type and only species, Regaliceratops peterhewsi, is known only from an adult individual with a nearly complete skull lacking the lower jaw, which was nicknamed "Hellboy". Regaliceratops was named in 2015 by Caleb M. Brown and Donald M. Henderson. Regaliceratops has an estimated length of and body mass of . The skull of Regaliceratops displays features more similar to centrosaurines, which suggests convergent evolution in display morphology in ceratopsids.

==Discovery and naming== thumb|left|St. Mary River Formation in Alberta, Canada In 2005, a skull of a ceratopsid was discovered by geologist Peter Hews from the St. Mary River Formation, along the Oldman River in southwestern Alberta. The skull was located in well cemented siltstone and with the tip of the snout sticking out of a cliff. The skull was excavated in 2006 and 2008 by a team of the Royal Tyrrell Museum and was removed in blocks. The excavation was described as being complicated as the specimen was in close proximity to protected spawning habitat for bull trout in the river. The specimen was nicknamed "Hellboy" due to the difficult and time-consuming excavation, in addition to the hard matrix, and the presence of small postorbital horncores with resorption pits. The specimen was subsequently named and described in 2015 by Caleb M. Brown and Donald M. Henderson.