I spent (Spent: The wing position of many aquatic insects when they fall on the water after mating. The wings of both sides lay flat on the water. The word may be used to describe insects with their wings in that position, as well as the position itself.) a while with a microscope to fairly positively identify this specimen as Ephemerella excrucians.
This mayfly was collected from the Bois Brule River on June 9th, 2005 and added to Troutnut.com on May 26th, 2006.
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