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WA Mayfly Description


Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
Heptageniidae
(Flatheaded Mayfly)
Flattened body; flattened horizontally oriented head; eyes & antennae visible from above; sprawling legs; gills on ab segs 1-7, most with tufts at base; 2 or 3 tails. 2 tails and large hind wings; 2 pairs of cubital intercalary veins present in FWs; 2 tails.


Taxonomic Name
(Common Name)
Larva (Nymph)Subimago (Dun)
Imago (Spinner)
Heptagenia
(Pale Evening Dun; PED. )
larva (nymph)

Copyright © 2005 Bob Newell

imago (spinner) - male

Copyright © 2005 Bob Newell

imago (spinner) - female

Copyright © 1997 Bryan E. Reynolds
HeptageniaSimilar size and shaped gills on all segments; additionally, fibrilliform gills on segment 7 as well as on others; tarsal claws with single basal tooth, no denticles; 3 tails. 1st segment of fore tarsi less than 1/2 length of 2nd segment; penis lobes are round.
Heptagenia elegantula  
Heptagenia solitaria
(Gray Fox; Ginger Quill Spinner. )
  
 Paired white spots on tergites; tufts on 7th gill. Body: tan/yellowish tan Wings: pale gray w/yellowish cast Length: 10-12 mm. Tails: 2 Emergence:.

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