The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
This very strange nymph appears to be undoubtedly Cinygmula, yet it lacks the telltale protruding mouthparts that usually make that genus so easy to identify.
This mayfly was collected from the Gulkana River in Alaska on July 17th, 2011 and added to Troutnut.com by Troutnut on July 20th, 2011.