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WA Mayfly Description

Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
(Common Burrower Mayfly )
Gills long with a feather-like fringe; tusks curve upward when viewed from side and are smooth (don't have small spines) on the half closest to the head; antannae w/whorls of long setae.Blotches or pigmented cross veins on wings, forewing A1 single, attached to hind margin by 2 or more veinlets; 2 or 3 tails.

Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
mature larva (nymph)

Copyright © 2009 Tim Loh

subimago (dun) - male

Copyright © 2010 Michael Butler

subimago (dun) - female

Copyright © 2011 Harvey Schmidt

imago (spinner) - male

Copyright © 2008 MR GREEN

imago (spinner) - female

Copyright © 2012 Richard Migneault
EphemeraHead w/ forked or bifid frontal process, mandibular tusks curving upward when viewed from side, w/hairs and spines near base; antennae w/whorls of long hairs along most of length. Wings with patterns of dark markings.
Ephemera simulans
(Brown Drake; Chocolate Dun; March Brown; March Brown Dun; Great Red Spinner. )
 Abdominal and fore wing pad markings. Body: brownish Wings: brown w/blackish mottling Length: 11-19 mm. Tails: 3 Emergence: Jun 20 - Jul 15.

State of Washington distribution is based on:
Mayflies (Ephemeroptera) of the far western United States (Part I: Washington) by M. D. Meyer & W. P. McCafferty,
and augmented by A DNA Barcode Library for North American Ephemeroptera: etc. by Webb, Jacobus, Funk, et. al.  

Created: 08/16/2013   Last modified: 12/07/2014    www.FlyfishingEntomology.com