Raptorex Raptorex Raptorex is a dubious genus of tyrannosaurid dinosaur. Its fossil remains consist of a single juvenile specimen probably uncovered in Mongolia, or possibly northeastern China. The type species is "R. kriegsteini", described in 2009 by Sereno and colleagues. The genus name is derived from Latin ', "robber", and ', "king". The specific name honours Roman Kriegstein, a survivor of the Holocaust, whose son Henry Kriegstein donated the specimen to the University of Chicago for scientific study. While initially considered to have come from the Yixian Formation of China, dated to approximately 125 million years ago during the early Cretaceous
Tyrannosaurus Tyrannosaurus Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex ("rex" meaning "king" in Latin), often called T. rex or colloquially T-Rex, is one of the most well-represented of the large theropods. "Tyrannosaurus" lived throughout what is now western North America, on what was then an island continent known as Laramidia. "Tyrannosaurus" had a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids, and among the