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
Specimens of Tyrannosaurus Also, two of the cervical vertebrae are fused, and another has additional bone growth. This could have been caused by another "Tyrannosaurus" bite. The bite marks are healed, indicating that Stan survived the wounds. Stan could also have been infected by "Trichomonas"-like parasites. Peck's Rex (also known as "Peckrex", "Rigby's rex" and "Tyrannosaurus" "imperator") is the nickname given to a fossil specimen found in Montana in 1997. The discovery was made by Louis E. Tremblay on 4 July 1997 working under the supervision of J. Keith Rigby Jr. who led the excavation and bone preparation. The fossil got its nickname