Acheroraptor

Acheroraptor is an extinct genus of dromaeosaurid theropod dinosaur that lived in present-day Montana in the United States during the Maastrichtian stage of the Late Cretaceous period. It was described by Canadian paleontologists David Evans, Derek Larson, and Philip J. Currie in 2013. The genus contains a single species, A. temertyorum, based on an isolated maxilla with teeth. An incomplete dentary found nearby was also assigned to the species. These fossils were initially discovered by commercial fossil collectors in the Hell Creek Formation, and were later sold to the Royal Ontario Museum. Acheroraptor is among the geologically youngest dromaeosaurids.