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WA Mayfly Description


Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
Ameletidae
(Primitive Minnow Mayfly )
Labrum without distinct notch in midline; gills with a sclerotized (hard) dark band along the outside margin; mouthparts with a comb of stiff spines; antennae shorter than twice the width of the head. .


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

Copyright © 2006 Tom Murray

subimago (dun) - female

Copyright © 2011 Arlo Pelegrin

imago (spinner) - male

Copyright © 2011 Bob Newell

imago (spinner) - female

Copyright © 2011 Arlo Pelegrin
AmeletusMaxillae w/comb of stiff spines; antennae shorter than twice width of head; gills: single oval w/dark hard band along margin; abdomen w/dark bands; tails much shorter than abdomen, w/broad dark bands & bristles entire length. Body yellowish brown to dark brown; wings barred dark gray, foremargin of hing wings w/sharp or pointed costal angulation.
Ameletus andersoni  
Ameletus celer  
Ameletus cooki  
Ameletus exquisitus  
Ameletus majusculus  
Ameletus oregonensis  
Ameletus pritchardi  
Ameletus similior  
Ameletus sparsatus  
Ameletus suffusus  
Ameletus validus  
Ameletus vancouverensis  
Ameletus velox  
Ameletus vernalis  

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