Tyrannosaurus rex Osborn, 1905 (Morphotype II)

Etymology: Tyrant lizard king

Holotype: CM 9340

Referred specimens: BHI 6230, BHI 6233, BHI 6435, BHI 6436, RSM 2523.8? BHI 4100? MNHUK R7994?

Age and stratigraphy: Latest Maastrichtian, upper and possibly middle Hell Creek and Lance, Ferris, Denver, Frenchman, Willow Creek, Scollard.

Geographic distribution: Montana, Colorado, Dakotas, Wyoming, Alberta, Saskatchewan.

Diagnosis: generally robust with an adult femur-length/ circumference ratio of about 2.4 or less; usually one slender anterior incisiform dentary tooth.