Phylogenetic Systematics oflguanine Lizards 



73 



FIG. 36. Dorsolateral views of the tweniieth presacral vertebrae of (A) Dipsosaurus dorsalis (KdQ 22) 

 and (B) Sauromalus obesus (RE 1578), showing absence and presence, respectively, of bony separation 

 (arrows) between the prezygapophyses and the zygosphenes. Scale equals 1 mm. 



