Fig. 1 in On the affinities of Tetraceratops insignis, an Early Permian synapsid

Fig. 1. Picture of the synapsid Tetraceratops insignis Matthew, 1908, AMNH 4526 (modified from Laurin and Reisz 1996), holotype (Clear Fork Group: Leonardian, Texas). Left lateral (A), palatal (B), and right lateral (C) views. Reproduced with permission from the Society of Vertebrate Paleontology.