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.

Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

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.

11 Recently Added Photos

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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Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun Pictures

This specimen is really strange, very different in form from any other mayfly I've seen. Unfortunately it was found alone crippled in an eddy and in pretty bad shape, and I couldn't find any others like it.

Ventral view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin

Dorsal view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin

Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin

Ruler view of a Female Heptageniidae (March Browns, Cahills, Quill Gordons) Mayfly Dun from the Long Lake Branch of the White River in Wisconsin The smallest ruler marks are 1/16".

This mayfly was collected from the Long Lake Branch of the White River in Wisconsin on June 28th, 2005 and added to Troutnut.com by Troutnut on May 26th, 2006.

Discussions of this Dun

Spinadis simplex

1 replies

Posted by Taxon on Jul 19, 2019

Last reply on Jul 20, 2019 by Troutnut

Hi Jason-

I believe this female to be a spinner, rather than a dun, and is probably Spinadus simplex.

Anyone know what this is?

Posted by Troutnut on Jun 25, 2006

Last reply on Jun 25, 2006 by Troutnut

I don't recognize this fly at all, and the major features are too damaged for me to follow my key to families. I'm guessing maybe it's some large and obscure species of Heptageniid, but it could be from some rare family of mayflies too.

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