Montana Field Guide

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- Kingdom - Animals - Animalia
  - Phylum - Spiders, Insects, and Crustaceans - Arthropoda
    - Class - Insects - Insecta
      - Order - Caddisflies - Trichoptera
        
        Family - Apataniid Caddisflies - Apataniidae
        
        Species - Two-hole Mountain Caddisfly - Allomyia bifosa

Two-hole Mountain Caddisfly - Allomyia bifosa

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Native Species

Global Rank: G3G4
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:

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General Description

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Species Range

Montana Range Range Descriptions

Native

Range Comments

Range includes Montana (Iceberg Lake in Glacier National Park; see Newell and Potter, 1975), Wyoming, British Columbia (Glacier, Mt. Revelstone National Park, Mt. Thornhill; see Nimmo and Scudder, 1978), and Alberta.

Observations in Montana Natural Heritage Program Database

Number of Observations: 40

(Click on the following maps and charts to see full sized version) Map Help and Descriptions

Relative Density

Recency

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

Habitat

Small foothills and mountain streams.

Stewardship Responsibility

References

Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Muhlfeld, C.C., T.J. Cline, J.J. Giersch, E. Peitzsch, C. Florentine, D. Jacobsen, and S. Hotaling. 2020. Specialized meltwater biodiversity persists despite widespread deglaciation. Proceedings of the National Academy of Sciences May 2020, 202001697; DOI: 10.1073/pnas.2001697117
- Nimmo, A.P. and G.G.E. Scudder. 1978. An annotated checklist of the Trichoptera (Insecta) of British Columbia. Syesis 11: 117-134.
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Dragonflies / Damselflies

Ferns and allies

Conifers

Flowering Plants (Dicots)

Flowering Plants (Monocots)

Citation for data on this website:
Two-hole Mountain Caddisfly — Allomyia bifosa. Montana Field Guide. Montana Natural Heritage Program. Retrieved on October 31, 2025, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=IITRIC6030