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Montana Field Guide

Montana Field Guides

A Mayfly - Acentrella insignificans

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
The genus, Acentrella are small mayflies (blue-winged olives) that are common in medium-large cool-water systems such as the Missouri and Yellowstone Rivers, but can also appear in smaller, cold-water trout streams that have some siltation and de-watering problems, as this genera is more silt-tolerant than some other mayflies.

Observations in Montana Natural Heritage Program Database
Number of Observations: 123

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Relative Density



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

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