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Montana Field Guide

Montana Field Guides

A Siphlonurid Mayfly - Siphlonurus occidentalis

Native Species

Global Rank: G5
State Rank: SNR

Agency Status

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General Description
We do not yet have descriptive information on this species.  Please try the buttons above to search for information from other sources.

Observations in Montana Natural Heritage Program Database
Number of Observations: 49

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Relative Density



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

This species has been collected from rocky but somewhat quiet organic rich edgewaters along relatively medium to large rivers in the montain western part of Montana.

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Citation for data on this website:
A Siphlonurid Mayfly — Siphlonurus occidentalis.  Montana Field Guide.  .  Retrieved on , from