An illustration of Peck's Rex, the only specimen attributed to Tyrannosaurus "imperator", with Trichomonas-like parasites infesting the back of its jaw.
Tyrannosaurus "imperator" is a proposed species of Tyrannosaurus that was believed to be around 20% larger than Sue. It is now known to be a larger-than-usual Tyrannosaurus rex. The specimen which was attributed to this species is now known as Peck's Rex or Peckrex. It is supposed to be 42 feet long and 21 feet tall at adulthood.