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Montana Field Guide

Montana Field Guides

Frigid Forestfly - Zapada frigida

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Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
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Species Range
Montana Range Range Descriptions


Range Comments
Rangewide, Zapada frigida is known from scattered localities in Alaska (SNR), Idaho (SNR), Montana (SNR), New Mexico (SNR), Utah (S1?) and in Canada, the Yukon Territory (SNR) (NatureServe 2006). Occurrences in the Northern Rocky Mountains are related to the higher elevation cold streams

In Idaho, Z. cordillera has only been reported from Sherman Creek in Idaho County (Baumann et al. 1977).
In Montana, Z. cordillera has been reported from scattered localities in Flathead and Glacier Counties, and from the Northern Rocky Mountain Refugium area of Mineral and Missoula Counties in west-central Montana (Baumann et al. 1977).

Observations in Montana Natural Heritage Program Database
Number of Observations: 43

(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, 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.

Zapada frigida has been described as a rare species due to habitat specificity (Baumann et al. 1977) and is never abundant when collected. It is globally secure and unranked in (SNR) in Montana.

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