Carr, T.E. & Williamson, T.D. 2010. Bistahieversor sealeyi, gen. et sp. nov., a new tyrannosauroid from New Mexico and the origin of deep snouts in Tyrannosauroidea. Journal of Vertebrate Paleontology, 30(1):1–16.

In 1998 a team of scientsist discovered tyrannosauroid remains of an adult and a juvenile specimen in the Campanian of the Bisti/De-Na-Zin Wilderness of New Mexico, now after years of studying the fossils they described it in the Journal of Vertebrate Paleontology and baptist it Bistahieversor sealeyi

The length of Bistahieversor is estimated to have been around 9 metres (30 ft). Bistahieversor has a deep snout. Geological barriers may have isolated Bistahieversor from its more advanced northern family members. Bistahieversor shares a few characteristics with more advanced tyrannosaurs, like the T. rex, but also has many, more primitive features as the possession 64 teeth, an extra opening above the eye, and a keel along the lower jaw. The opening above the eye is thought to have accommodated an air sac that would have lightened the skull\\\\\\\'s weight. Bistahieversor also had a complex joint at its \\\\\\\"forehead\\\\\\\" that would have stabilized the skull, preventing movement at the joint.

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