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Maccaffertium vicarium (March Brown) Mayfly Nymph Pictures

 I keyed this nymph to Stenonema fuscom, which is now synonymized with Maccaffertium vicarium. However, the size, markings, and time of year make me very skeptical of this identification.

This mayfly was collected from the Bois Brule River on June 9th, 2005 and added to Troutnut.com on May 26th, 2006.

Recent Discussions of this Nymph

M. vicarium? 8 Replies »
Posted by Entoman on Mar 26, 2012
Last reply on Jul 2, 2012 by Gutcutter
You were right about the markings, Jason. This is one of the paler Summer Cahill species, probably mexicanum. The inverted "U" tergal markings are very distinctive (moved to mexicanum).
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