The anterior musculature of C. wislizeni and C. collaris is described in detail and compared. Size and number relationships of the skull and its component bones, the sternum, the clavicle, the parts of the hyoid, the general body form, certain scales and teeth, and the eggs per clutch were determined for large samples of both species and then statistically compared. The general character of many structures is also compared and notes are made on C. reticulatus.
The differences encountered by this study, as well as the valid ones of those listed by Smith (1946:158–159) are not considered to be important generically and Gambelia is not given generic status.
Robison, Wilbur Gerald Jr. and Tanner, Wilmer W.
"A comparative study of the species of the genus Crotaphytus Holbrook (Iquanidae),"
Brigham Young University Science Bulletin, Biological Series: Vol. 2
, Article 1.
Available at: http://scholarsarchive.byu.edu/byuscib/vol2/iss1/1