FIGURE 8 in Craniofacial ontogeny in Tyrannosauridae (Dinosauria, Coelurosauria)

FIGURE 8. Comparison of Stage 1 (CMNH 7541) and Stage 4 (AMNH 5027, MOR 555) skulls of Tyrannosaurus rex in palatal (A, B), dorsal (C, D), lateral (E, F), caudal (G, H), and rostral (I, J) views. Numbered labels indicate T. rex autapomorphies: (1) nasal processes of the premaxillae tightly appressed throughout their entire length; (2) restricted exposure of the jugal within the antorbital fenestra; (3) antorbital fossa reaches the nasal suture caudodorsally; (4) transversely broad jugal pneumatic recess; (5) elongate frontal sagittal crest; (6) strongly divergent and short basal tubers; (7) rostroventrally-oriented caudal occipital plate; (8) shallow subcondylar recess; (9) rostroventrally deep basisphenoid plate and rostrocaudally-restricted basisphenoid recess; (10) inflated ectopterygoid; (11) strongly convex rostral plate of the surangular; (12) transversely narrow snout and broad temporal region relative to other tyrannosaurids; and (13) deep mandible relative to other tyrannosaurids.