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Montana Field Guide

Montana Field Guides

A Caddisfly - Neophylax occidentis

Native Species

Global Rank: G5
State Rank: SNR

Agency Status


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General Description
Neophylax caddisflies are a medium-sized insect (~3/4-1 inch) and adults which resemble moths, but fold their wings tent-like above their backs are commonly known as Autumn sedges. As larvae they are scrapers of algae and diatoms from cold river bottom rocks and cobbles, and emerge in concentrated numbers in the fall because they enter a pupal diapause within their rock/pebble cases during the summer (Diapause: A state of complete dormancy deeper even than hibernation. While in diapause, an organism does not move around, eat, or even grow). Some caddisfly larvae enter diapause for a few weeks to several months during the summer, which synchronizes their emergence to within three weeks on a given stretch of stream.

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

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

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Citation for data on this website:
A Caddisfly — Neophylax occidentis.  Montana Field Guide.  .  Retrieved on , from