. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. mittleman: the iguanid genus urosaurus 113 lation which is essentially simple, and shows no particular degree of differentiation. Sanromalus is considered a specialized offshoot of the Crotaphytus, or more properly, pve-Crotaphytus stock, by reason of its solid sternum, as well as the five-lobed teeth; the simple type of cephalic scalation indicates its affinity with the more primitive Dipsosaurus- STREPTOSAURUS UTA IIDnQAIIDIIQ PETROSAURUS^ \ UROSAURUS CROTAPHYTUS? SCELOPORUS CALL ISA URUS\/ SA TOR UMA*~^ HOLBROOKIA-
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. mittleman: the iguanid genus urosaurus 113 lation which is essentially simple, and shows no particular degree of differentiation. Sanromalus is considered a specialized offshoot of the Crotaphytus, or more properly, pve-Crotaphytus stock, by reason of its solid sternum, as well as the five-lobed teeth; the simple type of cephalic scalation indicates its affinity with the more primitive Dipsosaurus- STREPTOSAURUS UTA IIDnQAIIDIIQ PETROSAURUS^ \ UROSAURUS CROTAPHYTUS? SCELOPORUS CALL ISA URUS\/ SA TOR UMA*~^ HOLBROOKIA-. PHRYNOSOMA DIPSOSAURUS CTENOSAURA PRIMITIVE IGUANID TYPE Fig. 1. The phylogeny and relationships of North American iguanid genera. Ctenosaura stock. The three genera Uma, Callisaurus and Holbrookia form a compact group, presumably derived within comparatively recent times from a Crotaphytus-\ike stock. They resemble each other in the common type of dorsal scalation, and the imbricate super- ciliaries and supralabials. Uma is easily distinguished by reason of the enlarged digital fringes which Callisaurus lacks; Holbrookia does not possess auricular openings, which are present in the other two Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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