I think this is a pretty early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) Ameletus nymph. It's certainly a striking one.
This mayfly was collected from Mongaup Creek on May 6th, 2007 and added to Troutnut.com on May 18th, 2007.
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