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Photo#218706
Giant Mayfly (Subimago) - Epeorus

Giant Mayfly (Subimago) - Epeorus
Edmonton, Alberta, Canada
June 11, 2008
Im guessing Hexatoma?

Not a giant...
but a medium-size male subimago (dun) of the family Heptageniidae, probably in the genus Epeorus.

 
Thanks
But the biggest mayfly I've personally seen!

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