It can be distinguised from other tyrannosaurs by "a broad interfenestral strut, a deep fossa on the broad base of the septum between the promaxillary recess and maxillary antrum, a low position of the dorsal row of dentary foramina, a similar number of denticles per unit length on both the mesial and distal carinae of the upper and lower teeth, and an acute angle of about 70 degrees between the posterior process of the foot and the shaft of the pubis."