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Maccaffertium vicarium (March Brown) Mayfly Nymph Pictures

 I photographed this Maccaffertium vicarium nymph shortly after it molted to a new 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.) in my holding container. Many nymphs take on drastically different coloration immediately after molting, and this species is no exception.

This mayfly was collected from the Beaverkill River on April 19th, 2006 and added to Troutnut.com on April 21st, 2006.


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