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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Cinygmula subaequalis (Small Gordon Quill) Mayfly Nymph Pictures

This nymph is missing a few gills, but is otherwise in good shape. It was the only one of its species which turned up in my sample.

Here you can see the mouthparts protruding out the side in a top view of the head.  That's the identifying characteristic for Cinygmula.

Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Ventral view of a Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Dorsal view of a Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania
Ruler view of a Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Paradise Creek in Pennsylvania The smallest ruler marks are 1 mm.

This mayfly was collected from Paradise Creek in Pennsylvania on May 29th, 2007 and added to Troutnut.com by Troutnut on June 4th, 2007.


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Cinygmula subaequalis (Small Gordon Quill) Mayfly Nymph Pictures

Collection details
Location: Paradise Creek, Pennsylvania
Date: May 29th, 2007
Added to site: June 4th, 2007
Author: Troutnut
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