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WA Mayfly Description

Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
(Small Squaregilled Mayfly )
Head and pronota narrower than mesonota; no gills on abdominal segment one; gills on second segment large and square, visibly separate, and cover the other gills; hind wing pads usually absent; 3 tails. Robust thorax; small abdomen; 3 tails; no hind wings.

Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
(Angler's Curse; Little White Mayfly; Little White Spinner. )
larva (nymph)

Copyright © 2011 Steven Luk

imago (spinner) - female

Copyright © 2009 Kevin Hall
CaenisBody dark brown; head w/o prominent bumps; no hind wing pads; large square gills attached to back of 2nd abdominal segment; forelegs same length as others. Thorax brown.
Caenis amica  
Caenis latipennis  
Caenis youngi  

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