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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.
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Male Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

I used the ID of this nymph (and some others like it) to infer the identity of a female dun collected on the same trip.

This specimen (top left) is pictured with a couple others from the same kicknet sample just to show the variation in color.

Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Dorsal view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Lateral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Ruler view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington
Ventral view of a Male Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Nymph from Mystery Creek #249 in Washington

This mayfly was collected from Mystery Creek #249 in Washington on July 4th, 2020 and added to Troutnut.com by Troutnut on July 12th, 2020.


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Male Ephemerella excrucians (Pale Morning Dun) Mayfly Nymph Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 4th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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