This is a very 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.).
This mayfly was collected from the Namekagon River on January 13th, 2004 and added to Troutnut.com on January 25th, 2006.
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