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Montana Field Guide

Montana Field Guides

A Rhyacophilan Caddisfly - Rhyacophila unimaculata

Native Species

Global Rank: G2G3
State Rank: SNR

Agency Status


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General Description
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Range Comments
British Columbia endemic (Nimmo, 1977; Nimmo and Scudder, 1978; 1979; 1984; Scudder, 1996) in Robson and Fernie. Also in western Montana in Crane Creek, Flathead Lake, and Roy's Creek, Lake County (Newell and Potter, 1975).

Observations in Montana Natural Heritage Program Database
Number of Observations: 5

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Relative Density



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

This Rhyacophila species seems to prefer the small forested streams along the east side of Flathead Lake and potentially a few other similar streams in Lake and Sanders County. These steep-gradient, shaded, mossy cobble and woody rivulet streams fit the description of many habitats of our most narrowly restricted caddisflies.

Food Habits
Most Rhyacophila species are predators feeding mostly on aquatic insects, especially midges and blackflies

Limited data and the inability to identify larval collections has lead to a low global rank. Distribution data for U.S. states and Canadian provinces is known to be incomplete or has not been reviewed for this taxon.

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Citation for data on this website:
A Rhyacophilan Caddisfly — Rhyacophila unimaculata.  Montana Field Guide.  .  Retrieved on , from