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Bistahieversor
''Bistahieversor'' (meaning "Bistahi destroyer") is a genus of tyrannosaurid dinosaur. ''Bistahieversor'' existed in the Late Cretaceous Hunter Wash member of the Kirtland Formation, which has been dated to 74.55 ± 0.29 Ma.
The name ''Bistahieversor'' comes from the Navajo , or "place of the adobe formations" in reference to the Bisti/De-Na-Zin Wilderness where it was found, and ''eversor'', meaning "destroyer."〔
==Description==
Material from both adolescent and adult individuals has been found in the Kirtland Formation of New Mexico, United States. Adult ''Bistahieversor'' are estimated to have been around long, weighing at least a ton. The snout is deep, indicating that the feature is not unique to more derived tyrannosaurs such as ''Tyrannosaurus''. Geographical barriers such as the newly forming Rocky Mountains may have isolated the more southerly ''Bistahieversor'' from more derived northern tyrannosaurs.
''Bistahieversor'' differs from other tyrannosaurs in the possession of 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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