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Montana Field Guide

Montana Field Guides

A Siphlonurid Mayfly - Siphlonurus phyllis

Native Species

Global Rank: G3G4
State Rank: SNR

Agency Status

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General Description
This is a large, swimming mayfly capable of surviving in ponds and wetlands without flowing water. It occurs in western Montana in numerous ponds and wetlands around the West Glacier area, Glacier National Park, Flathead Co.; habitat also listed as ponds and beaver ponds in Glacier Co. (McCafferty and Newell, 2007).

Range Comments
This mayflies range includes Montana (SNR), Alberta(SNR), British Columbia (SNR), Northwest Territories (SNR), Ontario (SNR), Yukon Territory (S3S4)

Observations in Montana Natural Heritage Program Database
Number of Observations: 20

(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)

Emergent wetlands: all had organic substrates with extensive emergent vegetation (mostly sedges). Some sites were temporary, but others were permanent beaver ponds. S. phyllis sites were scattered around the park but were limited to valleys (Hossack et. al 2010)

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Citation for data on this website:
A Siphlonurid Mayfly — Siphlonurus phyllis.  Montana Field Guide.  .  Retrieved on , from