Maccaffertium vicarium (March Brown) Mayfly Nymph Pictures

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Heptageniidae (March Browns, Cahills, Quill Gordons)

» Genus Maccaffertium (March Browns and Cahills)

» Species vicarium (March Brown)

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.

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Maccaffertium vicarium (March Brown) Mayfly Nymph from the Bois Brule River in Wisconsin

AuthorTroutnut

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

AuthorTroutnut

CameraCanon EOS 20D

View Full Size and Comment (2X larger)

AuthorTroutnut

CameraCanon EOS 20D

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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Maccaffertium vicarium (March Brown) Mayfly Nymph Pictures

Recent Discussions of this Nymph

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Jargon Defined: