Fig. 4 in A new tyrannosaurine (Theropoda:Tyrannosauridae) from the Campanian Foremost Formation of Alberta, Canada, provides insight into the evolution and biogeography of tyrannosaurids

Fig. 4. Right maxilla of Thanatotheristes holotype (TMP 2010.5.7) in lateral view with A) known fragments overlain on hypothesized reconstruction and B) subcutaneous surface magnified. The subcutaneous surface is strongly ornamented and possesses autapomorphic dorsoventral ridges (arrows). Extent of antorbital fossa indicated by black dash line. Large healed bite mark is indicated by white dash line. Abbreviations: aofo, antorbital fossa; mf, maxillary fenestra; pmf, promaxillary fenestra; pnf, posterior-most neurovascular foramen; scs, subcutaneous surface; sppm, subnarial process of premaxilla. Scale bar equals 5 cm.