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Montana Field Guide

Montana Field Guides

A Mayfly - Ametropus neavei

Native Species

Global Rank: G4G5
State Rank: SNR

Agency Status


External Links

General Description
A large sand-dwelling mayfly that runs over underwater sandbars like an underwater tiger beetle.

Species Range
Montana Range Range Descriptions


Range Comments
The eastern range limit of this species is North Dakota, Manitoba and Saskatchewan (Guenther and McCafferty, 2005) It is recorded for CO, MT, ND, NM, UT, WI, WY Canada AB, NT, SK . In MT it os found in the Milk River system near the canadian border, the Missouri River >100 miles down from Fort Peck and the Lower Yellowstone and Powder River systems.

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

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



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

This species highly associated with larger, perennially flowing prairie rivers with gravel-cobble riffles and shifting sandy bottom runs and pools.

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Citation for data on this website:
A Mayfly — Ametropus neavei.  Montana Field Guide.  .  Retrieved on , from