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
Valley of the T. rex "Tyrannosaurus" over time lost the ability to run and evolved to more specialization as a walking scavenger. It has been argued by Garner, however, that the shinbone of "Wankelrex" are restored from broken fragments, making it inaproppriate as reference in comparative morphology. Also, according to other reports, "G-rex" also have longer thighbone (1.26 meters) than shinbone (1.12 meters). Holtz also points out that longer thighbones than shinbones is a condition also found in horses, which are fast running animals. A shorter shinbone might be compensated by a relatively long metatarsus, which is seen both in horses and tyrannosaurids. Other scientists