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Montana Field Guide

Montana Field Guides

Checkered Stripetail - Isoperla pinta

Native Species

Global Rank: G4
State Rank: SNR

Agency Status


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General Description
This fairly rare, Isoperlid Stonefly is limited in distribution to 3 counties in Montana and limited in the Northern and Sounthern Rocky Mountains--Wyoming, Idaho, Colorado and Utah., but is common elsewhere in the Casacade and Coastal Ranges

Range Comments
Common in creek and rivers of the Pacific Northwest, but rare in the Rocky Mountains

This species occurs and is common in creeks and rivers (Baumann et al. 1977). Nymphs were found in large woody debris and mossy cobbles. Merritt and Cummins (1996) describe Yoraperla trophic relationships as shredders (large organic detritus, plant materials).

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.

Adults emerge from March- July.

Limited in distribution in Montana, but is found elsewhere in the Cascade, Coastal, Northern and Southern Rocky Mountains including British Columbia, Oregon, Wyoming, Idaho, Colorado and Utah. This species is known from 3 collection sites in Montana.

Threats or Limiting Factors
Specific threats to MT/ID populations of C. trictura have not been identified. In general, stonefly populations are affected by alterations of aquatic habitat such as changes of flow patterns, streambed substrate, thermal characteristics, and water quality. Degradation of aquatic habitat is the primary concern for any population.

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