Also see this (sent to me by Comely1): http://www.sciencenews.org/articles/20060211/fob1.asp
Oldest T. rex relative unveiled
(Image: Zhongda Zhang/IVPP)
An early forefather of Tyrannosaurus rex has been discovered. The 160 million-year-old fossil is the oldest tyrannosaur ever found. It has been named Guanlong wucaii – which is derived from the Chinese for “crowned dragon”.
- “The discovery of this new animal pushes the origin of the group containing T. rex further back in time and also shows that early tyrannosaurs had a much wider distribution than previously thought.”
Guanlong lies at the base of the lineage of tyrannosaurides
Eotyrannus was dwarfed by other predators in its environment
T. rex was a member of theTyrannosauridae family