Sceloporus tristichus

Sceloporus tristichus formerly was included in S. undulatus. The traditionally recognized Sceloporus undulatus is morphologically highly variable (e.g., see Stebbins 1985, Conant and Collins 1991, Hammerson 1999). Recent genetic studies indicate that the species comprises multiple species that do not conform with traditionally recognized subspecies.

Leaché and Reeder (2002) examined range-wide mtDNA variation and identified at least four apparently monophyletic (but morphologically highly variable) groups, which they proposed as species under the evolutionary species concept (Eastern group: east of Mobile Bay; Central group: east of the Rockies and west of Mobile Bay; Western group: southern Wyoming to central Arizona and northern New Mexico; Southwestern group: eastern Arizona and central New Mexico to northern Mexico and western Texas). All of the groups are discordant with recognized subspecies circumscriptions. For example, the Central group encompasses six nominal subspecies ranging from the foothills of the Rocky Mountains in Colorado to the Gulf Coast of southern Mississippi. Populations of the morphologically distinctive subspecies erythrocheilus in central Colorado grouped with subspecies garmani (Central group) rather than with populations of erythrocheilus in south-central Colorado (Western group). Leaché and Reeder (2002) tentatively proposed the following names: eastern group, S. undulatus; central group, S. consobrinus; western group, S. tristichus; southwestern group, S. cowlesi. However, Leaché and Reeder identified no diagnostic characters for any of the proposed species, and the distributions of proposed species were only coarsely mapped and do not correspond closely with the distributions of previously recognized subspecies, leaving in doubt the specific identities of many Sceloporus populations.

Further integrated study of genetic variation, using mitochindrial and nuclear DNA, and more detailed genetic examination of various geographic areas (Niewiarowski et al. 2004; Leaché and Cole 2007; Leaché 2009) has helped clarify relationships among "S. undulatus" populations. Recognition of the four species proposed by Leaché and Reeder (2002) seems to be a justifiable change in the treatment of this complex, but the precise distributions of the taxa near some clade boundaries remain problematic. Leaché and Cole (2007) acknowledged the challenges imposed by apparent decoupling of morphological, karyotypic, and mtDNA divergence that may occur among populations in this complex and noted that conclusions about the number of species in the S. undulatus complex are directly linked to the particular "threshold' one imposes to define species status.

Leaché and Cole (2007) presented evidence for hybridization between S. cowlesi and S. tristichus in an ecotone in eastern Arizona.

According to Leaché and Reeder (2002), the range includes southwestern Wyoming, most of eastern and southern Utah, western and southcentral Colorado, much of northern and central Arizona, and northern New Mexico. Leaché and Reeder (2002) provided only coarse-scale range maps and did not include distributional details for areas where the range of this species adjoins or approaches the ranges of S. consobrinus or S. cowlesi. Leaché and Cole (2007) presented evidence for hybridization between S. tristichus and S. cowlesi in Arizona.

This species is represented by a large number of occurrences (subpopulations) and locations.