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Blue-winged Olives
Baetis

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.

Paraleptophlebia (Blue Quills) Mayfly Nymph Pictures

Looking at this one under the microscope, I noted that is has untracheated gills which fork 1/3 of the way from the base and postero-lateral spines on abdominal segment 9

This mayfly was collected from unknown in Wisconsin on February 7th, 2004 and added to Troutnut.com by Troutnut on January 25th, 2006.

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