Fig. 4 in On the affinities of Tetraceratops insignis, an Early Permian synapsid

Fig. 4. Reconstructions (A–D) or specimen drawings (E) in lateral view of synapsid skulls. A. Haptodus garnettensis Currie, 1977 (modified from Laurin 1993). B. Dimetrodon limbatus Cope, 1877, sagittal section (modified from Romer and Price 1940). C. Tetraceratops insignis Matthew, 1908 (modified from Laurin and Reisz 1996). D. Syodon efremovi Orlov, 1940 (modified from Orlov 1958). E. Lycaenops angusticeps (Broom, 1913) UCMP 42701 (modified from Laurin 1998). The quadrate is colored in green, epipterygoid in blue, upper postcanines in orange, and upper margin of the temporal fenestra in purple.