Montana Field Guide

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- Kingdom - Animals - Animalia
  - Phylum - Spiders, Insects, and Crustaceans - Arthropoda
    - Class - Insects - Insecta
      - Order - Mayflies - Ephemeroptera
        
        Family - Heptageniid Mayflies - Heptageniidae
        
        Species - Elegant Flat-headed Mayfly - Heptagenia elegantula

Elegant Flat-headed Mayfly - Heptagenia elegantula

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Native Species

Global Rank: G5
State Rank: SNR

Agency Status
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General Description

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Species Range

Montana Range Range Descriptions

Native

Observations in Montana Natural Heritage Program Database

Number of Observations: 42

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Relative Density

Recency

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

Stewardship Responsibility

References

Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?
- Baril, S.F. 1977. Benthic invertebrate distribution, abundance, and diversity in Rosebud Creek, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 97 p.
- Fraley, J.J. 1978. Effects of elevated summer water temperatures below Ennis Reservoir on the microinvertebrates of the Madison River, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 120 p.
- Hendricks, P., S. Lenard, D.M. Stagliano, and B.A. Maxell. 2013. Baseline nongame wildlife surveys on the Fort Peck Indian Reservation. Report to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation. Montana Natural Heritage Program, Helena, MT. 83 p.
- Zillges, G.F. Jr. 1971. The aquatic insects of Bluewater Creek, Montana, above and below an area of intensive agriculture. M.Sc. Thesis. Bozeman, MT: Montana State University. 29 p.
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Citation for data on this website:
Elegant Flat-headed Mayfly — Heptagenia elegantula. Montana Field Guide. Montana Natural Heritage Program. Retrieved on October 31, 2025, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=IIEPH38040