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Montana Field Guide

Montana Field Guides

A Mayfly - Caudatella jacobi

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Native Species

Global Rank: G3G4
State Rank: SNR

Agency Status


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General Description
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Range Comments
Known from British Columbia, Oregon, and Montana. The global ranking of this species may well increase as new collections from western states, including Montana, Oregon and Washington, are studied. Recently reported from a site in Juneau County, Alaska (Randolph and McCafferty, 2005).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

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Relative Density



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

Habitat appears similar to the better known Caudatella hystrix, including riffle habitats in small to medium sized streams and often in association with algal growths and cobbles (McCafferty 2003).

Food Habits
Caudatella larvae are scrapers and collectors-gatherers feeding on detritus, algae and diatoms) (Cummins and Merritt 1996).

Threats or Limiting Factors
All forms of stream quality degradation pose potential threats to cold-water mayflies. These include siltation; pollution from agricultural and industrial waste; and hydrological alteration from diversions, dams, or withdrawal of excess water for human use.

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