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Isonychia bicolor (Mahogany Dun) Mayfly Nymph Pictures

 This Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.

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

This species does not behave well for the camera, so  I eventually killed this specimen in alcohol to get a better picture of the mouth parts.  This resulting unnatural pose shows them well.  Isonychia bicolor (Mahogany Dun) Mayfly Nymph from the Beaverkill River in New York
This species does not behave well for the camera, so I eventually killed this specimen in alcohol to get a better picture of the mouth parts. This resulting unnatural pose shows them well.

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