Phylo genetic Systematics of I guanine Lizards 



55 



B 



FIG. 26. Lateral views of the right mandibles of (A) Dipsosaurus dorsalis (RE 359), (B) Brachylophus 

 vitiensis (MCZ 160254), and (C) Iguana iguana (RE 453), showing differences in the anterior extent of the 

 surangular (shaded). Scale equals 0.5 cm. 



there appears to be a transformation of this part of the surangular from exposed to 

 unexposed during the postembryonic ontogenies of Amblyrhynchus and Conolophus. 

 Some intraspecific variation exists in this feature; but other than the taxa in which the 

 unexposed portion of the surangular is the common condition, only in Brachylophus 



