Fig. 5. A, B in The brachyopoid Hadrokkosaurus bradyi from the early Middle Triassic of Arizona, and a phylogenetic analysis of lower jaw characters in temnospondyl amphibians

Fig. 5. A, B. Comparisons between the skull of Vigilius wellesi Warren and Marsicano, 2000 (A) and the lower jaw of Hadrokkosaurus bradyi (Welles, 1947) (B) drawn to the same proportions; arrows point to changes in degree of curvature of the skull and jaw (skull modified from Warren and Marsicano 2000). C. Right lower jaw ramus of Hadrokkosaurus bradyi (Welles, 1947) in dorsal view showing lengths of segments used for calculating the degree of curvature of the ramus (see text for details). D. Close−up view of posterior part of UCMP 36199, early Anisian, northeastern Arizona.