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Montana Field Guide

Montana Field Guides

Plains Stripetail - Isoperla longiseta

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
This stonefly species has been most often reported from Montana's larger mainstem rivers including the Yellowstone and Misouri in the warmer prairie regions of the state. Like most species in the Perlodidae family, this predator feeds on other aquatic insects, especially blackflies and other diptera larvae, from the cobbles of riffles.

Observations in Montana Natural Heritage Program Database
Number of Observations: 15

(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)

Food Habits
Merritt and Cummins (1996) report that members of the families, Perlidae and Perlodidae, are largely predators eating other aquatic invertrebrates, especially Diptera (Chironomidae and Simuliidae, midges and blackflies) and Mayflies.

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Citation for data on this website:
Plains Stripetail — Isoperla longiseta.  Montana Field Guide.  .  Retrieved on , from