New Species of Tyrannosaur Discovered in Southwestern U.S.

A new species of tyrannosaur has been discovered in the Bisti/De-na-zin Wilderness of New Mexico. Bistahieversor was different from other tyrannosauroids in having an extra opening above its eye, a complex joint at its "forehead," and a keel along its lower jaw; it also had more teeth than its distant relative T. rex.

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