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Montana Field Guide

Montana Field Guides

Columbian Forestfly - Zapada columbiana

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.

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 260

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



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

The larvae of this species are found in small-medium, high gradient mountain streams (Newell and Minshall 1978), and are indicators of the Pristine Mountain Stream Ecological System (Stagliano 2005). Most Nemouridae species are shredders or collector-gatherers utilizing coarse plant materials (Merritt and Cummins 1996).

Food Habits
Merritt and Cummins (1996) report that members of this family are trophically shredder-detritivores; eating large particulate organic materials such as detritus, leaves and plants.

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Citation for data on this website:
Columbian Forestfly — Zapada columbiana.  Montana Field Guide.  .  Retrieved on , from