Distribution

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Range Description

This species occurs on the border region of Arizona, Nevada, and Utah, USA, mostly below 1,000m asl. It was known from the Virgin and Muddy River drainages and along the Colorado River drainage downstream of its confluence with the Virgin River to Black Canyon below Lake Mead (Bradford, Jaeger and Jennings 2004, Bradford, Jennings and Jaeger 2005). In the late 1990s, the species could be found at seven sites in three general areas: a spring near Littlefield, Arizona, on the Virgin River; several springs along the Nevada side of the Overton Arm of Lake Mead; and within several springs in the Black Canyon along the Nevada side of the Colorado River (Jaeger et al. 2001; Bradford, Jaeger and Jennings 2004, Bradford, Jennings and Jaeger 2005). By 2001, two of these populations, including the one near Littlefield, had gone extinct (Bradford, Jaeger and Jennings 2004, Bradford, Jennings and Jaeger 2005).

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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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