New Information on the Cranial Anatomy of Acrocanthosaurus atokensis and Its Implications for the Phylogeny of Allosauroidea (Dinosauria: Theropoda)
Figure 44
Illustration of character 59 (Appendix S1).
Left quadrates of (A) Allosaurus fragilis (UUVP 3082), (B) Acrocanthosaurus atokensis (NCSM 14345), and (C) Mapusaurus roseae (image modified from [36]) in posterior view. lc, lateral condyle; mc, medial condyle; ppr, posterior pneumatic recess; Q, quadrate; QJ, quadratojugal; qj, space occupied by quadratojugal; quf, quadrate foramen.