Left quadratojugal and quadrate of Acrocanthosaurus atokensis (NCSM 14345).

Quadratojugal and quadrate in (A) lateral, (B) posterior, and (C) medial views. Hatched lines represent missing material. j, jugal contact; lc, lateral condyle of quadrate; ltf, lateral temporal fenestra; mc, medial condyle of quadrate; mpr, medial pneumatic recess of quadrate; ppr, posterior pneumatic recess of quadrate; pt, pterygoid contact; Q, quadrate; qc, quadrate cotylus; QJ, quadratojugal; quf, quadrate foramen; sq, squamosal contact.