Illustration of character 83 (Appendix S1).

2011-03-21T01:13:49Z (GMT) by Drew R. Eddy Julia A. Clarke
<p>Left epipterygoids of (A) <i>Allosaurus fragilis</i> (UUVP 1414) and (B) <i>Acrocanthosaurus atokensis</i> (NCSM 14345) in medial view. Both elements shown are complete. <b>ls</b>, laterosphenoid contact.</p>