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Montana Field Guide

Montana Field Guides

A Mayfly - Callibaetis ferrugineus

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.

Diagnostic Characteristics
Larvae of C. ferrugineus can be distinguished from those of C. pallidus by the presence of a dark sub-apical band on the femora. (Check 1982) noted that the dark band is absent in some western populations of C. ferrugineus; the relatively short (5-7.5 x longer than wide) apical seta of the tarsi will differentiate these specimens from C. pallidus (Webb 2002).

Observations in Montana Natural Heritage Program Database
Number of Observations: 99

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Relative Density



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

Callibaetis is common in lakes, permanent ponds, and slow-flowing portions of streams throughout North America.

Reproductive Characteristics
Adults were collected between May and September and it is likely that more
than one generation occurs per year.

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