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—Widespread karyotypic sampling in the lizard Sceloponis ^raciosiis Baird & Girard has confirmed previous reports ofchromosomal monotypy. Most individuals throughout the range have a diploid karyotype of2N =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. A major study is currently in progress to determine the population genetic structure of the chromosomally monotypic sagebrush lizard, Sceloponis graciosus Baird & Girard. In this study 112 individuals from seven western states (AZ, CA, CO, ID, NV, UT, WY) were karyotyped to confirm chromosomal monotypy, and all but two individuals showed the previously reported 2N = 30 normal karyotype (Gole 1971, 1975a, Jackson and Hunsaker 1970). One showed a triploid karyotype, and another possessed an extra bivalent in diakinesis spreads. The former represents the third known case of unusual triploidy in a species of Sceloponis , and the latter may be an example of a supernumerary chromosome.

Two aberrant karyotypes in the sagebrush lizard (Sceloporus graciosus): Triploidy and a "supernumerary" oddity