IUCN threat status:

Endangered (EN)


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Range Description

Rana muscosa occurs in the southern Sierra Nevada of California and in mountains to the south in southern California. In southern California south of the Sierra Nevada, the historical range extended from Palomar Mountain in San Diego County northward and westward through the San Jacinto, San Bernardino, and San Gabriel Mountains of Riverside, San Bernardino, and Los Angeles counties; these formed four isolated clusters of montane populations (Vredenburg et al. 2007). Additionally, the species occurred as an isolated cluster of populations on Breckenridge Mountain, south of the Kern River in Kern County, and in the Sierra Nevada (west of the crest) in Tulare, Inyo and Fresno counties, extending north to Mather Pass (Vredenburg et al. 2007). The mountain ridges that separate the headwaters of the South Fork Kings River from the Middle Fork Kings River, from Mather Pass to the Monarch Divide, form the northern border of the range. Rana muscosa is now extirpated on Palomar and Breckenridge mountains and in much of the former range elsewhere in southern California and the southern Sierra Nevada (USFWS 2006, Vredenburg et al. 2007). Elevational range in southern California is 1,220-7,560 feet (370-2,290 meters (Stebbins 1985, USFWS 2002).


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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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