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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Drunella cornuta (Large Blue-Winged Olive) Mayfly Nymph Pictures

Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Ventral view of a Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Dorsal view of a Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin
Drunella cornuta (Ephemerellidae) (Large Blue-Winged Olive) Mayfly Nymph from the Long Lake Branch of the White River in Wisconsin

This mayfly was collected from the Long Lake Branch of the White River in Wisconsin on June 5th, 2005 and added to Troutnut.com by Troutnut on May 25th, 2006.

Discussions of this Nymph

Drunella "lata" recently revised.
2 replies
Posted by Dsc1 on Oct 25, 2008
Last reply on Oct 26, 2008 by Troutnut
Dave Funk et al. (2008) just reestablished the species of D. cornuta and D. cornutella in a very elegant paper looking at morphological, biological, and molecular evidence. The three species are easily identifiable in New Hampshire. Your photos above seems to be of Drunella cornuta.

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Drunella cornuta (Large Blue-Winged Olive) Mayfly Nymph Pictures

Collection details
Location: Long Lake Branch of the White River, Wisconsin
Date: June 5th, 2005
Added to site: May 25th, 2006
Author: Troutnut
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