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This undated handout illustration provided by the journal Science shows a Raptorex. Weighing as little as 1/100th of its descendant T.Rex, Raptorex shows off its distinctive body plan of this most dominant line of predatory dinosaurs. About 125 million years ago a tiny version of Tyrannosaurus rex roamed what is now northeastern China. Tiny, that is, by T. rex standards — you still wouldn't want to meet it face to face. Described by paleontologist Paul Sereno as 'punk size,' this early predator stood about 9 feet tall. It just seems small compared to the giant T. rex that evolved millions of years later and was as much as 100 times more massive.

About 125 million years ago a tiny version of Tyrannosaurus rex roamed what is now northeastern China. Tiny, that is, by T. rex standards — you still wouldn't want to meet it face to face.

Described by paleontologist Paul Sereno as "punk size," this early predator would have weighed about 150 pounds.

It just seems small compared to the giant T. rex that evolved millions of years later and was as much as 100 times more massive.

"It really is the blueprint for the later (T. rex) dinosaurs," Sereno said, "it was a blueprint that was scalable."

Described for the first time in Thursday's ScienceExpress, the online edition of the journal Science, the new dinosaur has been named Raptorex kriegsteini.

Source - Early, smaller version of T. rex discovered - Yahoo! News