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Montana Field Guide

Montana Field Guides

A Mayfly - Baetis flavistriga

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
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Diagnostic Characteristics
B. flavistriga larvae are differentiated from other Baetis by the presence of 3 banded caudal filaments, a the large dark spot on the middle femora, the presence of 2 kidney shaped pale areas on the posterior margin of the abdominal terga segments 6 & 7, and by broad labial palps.

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 46

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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 — Baetis flavistriga.  Montana Field Guide.  .  Retrieved on , from