Widespread karyotypic sampling in the lizard Sceloporus graciosus Baird & Girard has confirmed previous reports of chromosomal monotypy. Most individuals throughout the range have a diploid karyotype of 2N = 30 consisting of 12 biarmed macrochromosomes and 18 microchromosomes. A single female karyotyped from the vicinity of Riverside, California, was unmistakably triploid, showing 3N = 45 with 18 macrochromosomes and 27 microchromosomes. This female appeared phenotypically normal but appeared reproductively incompetent. A male from Zion National Park, Utah, showed an extra bivalent in some diakinesis arrays, which apparently represents a supernumerary chromosome.
Thompson, Pamela and Sites, Jack W. Jr.
"Two aberrant karyotypes in the sagebrush lizard (Sceloporus graciosus): triploidy and a "supernumerary" oddity,"
Great Basin Naturalist: Vol. 46
, Article 7.
Available at: http://scholarsarchive.byu.edu/gbn/vol46/iss2/7