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Montana Field Guide

Montana Field Guides

A Mayfly - Baetis bicaudatus

Native Species

Global Rank: G5
State Rank: S5

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.

Diagnostic Characteristics
B. bicaudatus larvae are differentiated from other Baetis by the presence of 2 unbanded caudal filaments and broad thumb-shaped labial palps. Montana's only Baetis with 2 tails.

Observations in Montana Natural Heritage Program Database
Number of Observations: 221

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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 bicaudatus.  Montana Field Guide.  .  Retrieved on , from