FIGURE 19. Results of four parsimony analyses implementing the constraint trees shown in Figure 13A–D. (A) Strict consensus of 4 most parsimonious trees (tree length = 5973; CI = 0.528; RI = 0.540; RC = 0.285) implementing the constraint tree depicted in Figure 13A (Cryptocleidoidea; sensu O'Keefe 2001a, 2004b). The tree is 149 steps longer than the strict consensus tree shown in Fig. 14. (B) Strict consensus of 3 most parsimonious trees (tree length = 5906; CI = 0.534; RI = 0.551; RC = 0.294) implementing the constraint tree of Figure 13B (holding Simolestes as the sister taxon of Leptocleidus + Umoonasaurus; sensu O'Keefe 2001a, 2004b). The tree is 104 steps longer than the strict consensus tree shown in Fig. 14. (C) Strict consensus of 3 most parsimonious trees (tree length = 5867; CI = 0.537; RI = 0.558; RC = 0.300) implementing the constraint tree depicted in Figure 13C (clustering Leptocleidus and Umoonasaurus with traditionally recognized large­skulled pliosaurid taxa). The tree is 65 steps longer than the strict consensus tree shown in Fig. 14. (D) Strict consensus of 3 most parsimonious trees (tree length = 5829; CI = 0.541; RI = 0.564; RC = 0.305) implementing the constraint tree depicted in Figure 13D (holding TMP 94.122.01 as the sister taxon to Leptocleidus and Umoonasaurus). The tree is 27 steps longer than the strict consensus tree shown in Figure 14.