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Montana Field Guide

Montana Field Guides

A Mayfly - Baetis intercalaris

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
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Diagnostic Characteristics
Baetis intercalaris larvae are from other Montana Baetis by the presence of three banded caudal filaments, a large dark spot on the middle femora, wide labial palps, and three, round pale areas on the posterior margin of the abdominal terga (Waltz et al. 1996).

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 17

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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 intercalaris.  Montana Field Guide.  .  Retrieved on , from