IUCN threat status:

Least Concern (LC)


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Range Description

This species is widely distributed in the US and Canada, occurring from Arizona northwards through Colorado to Montana, and up the Pacific coast through California to British Columbia (NatureServe 2009). It also occurs in Mexico, although it is only known from three localities: one in Xochimilco Lake near Mexico City; one in the Valles River in San Luis Potosi; and one from Lake Patzcuaro in Michoacn (Thompson 2008). Hovingh (2004) disputes the classification of the Mexican and US/Canadian populations within a single species, based on morphology.


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© International Union for Conservation of Nature and Natural Resources

Source: IUCN

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