DistributionRead full entry
Range DescriptionThis species ranges from western and central Arizona and southwestern New Mexico, in the USA, south to northern Sonora and northwestern Chihuahua, and south-central and southeastern California and adjacent Arizona, from San Felipe Creek to the Colorado River (Painter 1985, Jennings and Hayes 1994). It usually occurs below 1,000m asl, to 1,700m asl in central Arizona (Platz and Frost 1984, Stebbins 1985). It has apparently been extirpated in Imperial Valley, California, and along the lower Colorado River, Arizona-California, though it might be extant in some areas close to the Colorado River in Arizona (Clarkson and Rorabaugh 1989, Jennings and Hayes 1994). It has been replaced by the introduced R. berlandieri along the Colorado and Gila rivers, Arizona (Clarkson and Rorabaugh 1989). In Arizona, it is found in every county except Apache and Navajo with 57% of all localities occurring in Gila, Maricopa, and Yavapai counties (Sredl et al. 1997). It is believed to be extirpated from New Mexico (New Mexico Department of Game and Fish 1997).