This is a really really really really tiny mayfly nymph. It has gills on abdominal segments 3-7 in the characteristic orientation for the Ephemerellidae family, and it has no fain tail as best I can tell, just uniform tail coverage with small black hairs of equal length. I think this one's too young to identify.
This mayfly was collected from unknown on March 10th, 2004 and added to Troutnut.com on January 19th, 2006.
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