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 than the track described by Lockley and Hunt. Whether or not the track was made by "Tyrannosaurus" is unclear, though "Tyrannosaurus" and "Nanotyrannus" are the only large theropods known to have existed in the Hell Creek Formation. A set of footprints in Glenrock, Wyoming dating to the Maastrichtian stage of the late cretaceous and hailing from the Lance Formation were described by Scott Persons, Phil Currie et al. in January 2016, and are believed to belong to either a juvenile "Tyrannosaurus rex" or the dubious tyrannosaurid "Nanotyrannus lancensis". From measurements and based on the positions of the footprints, the animal