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Montana Field Guide

Montana Field Guides

A Mayfly - Anafroptilum bifurcatum

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
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Range Comments
Centroptilum bifurcatum is distributed from Ontario to eastern British Columbia in Canada, and also occurs in the northern Rocky Mountain States (Webb 2002). In Saskatchewan, C. bifurcatum was found primarily in large rivers. In Oregon, it occurs in Benton, Deschutes, and Malheur Cos. (Meyer and McCafferty 2007). It occurs in western Montana in Flathead, Glacier, Lake, Lincoln Cos. (McCafferty and Newell 2007). It was recently documented in the Humboldt River (just below the confluence of the North Fork), Nevada (Kondratieff and Baumann 2000).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

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Relative Density



(Observations spanning multiple months or years are excluded from time charts)

In Saskatchewan, C. bifurcatum was found primarily in large rivers (Webb 2002).

Reproductive Characteristics
Mature larvae first appeared in early
June and adults were collected between late June and mid-July.

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Citation for data on this website:
A Mayfly — Anafroptilum bifurcatum.  Montana Field Guide.  .  Retrieved on , from