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WA Mayfly Description


Taxonomic Name
(Common Name)		Larva (Nymph)Subimago (Dun)
Imago (Spinner)
Ephemerellidae
(Spiny Crawler Mayfly )		Diverse shapes and sizes, but usually robust, sometimes flattened, often with tubercles or spines; always with 3 tails; wholly dorsal gills (never on Ab2) which slightly overlap and undute sequentially. 3 tails; pronounced angle on fore margin of hind wings; short unattached intercalary veins on outer margin of FW.


Taxonomic Name
(Common Name)		Larva (Nymph)Subimago (Dun)
Imago (Spinner)
Timpanoga
nymph (ventral view)

Copyright © 2007 Roger Rohrbeck

subimago - male

Copyright © 2008 Joshua Bergan

TimpanogaHead w/complete frontal shelf; no gills on adominal. segment 3, gills on segment 4 covering succeeding pairs; tarsal claws w/o denticles; maxillae w/palps. .
Timpanoga hecuba hecuba  
Timpanoga hecuba pacifica  
  Body dark reddish brown; wings dark gray; length 14-16 mm.; 3 tails.

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