Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Ephemerella is a very common genus of mayfly in Montana but nymphs are difficult to identify to species.
This mayfly was collected from Rock Creek in Montana on June 12th, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.