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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.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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 dorothea infrequens (Pale Morning Dun) Mayfly Dun Pictures

This dun was collected in proximity to this spinner.

Lateral view of a Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana
Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana
Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana
Ventral view of a Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana
Ruler view of a Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana The smallest ruler marks are 1 mm.
Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana
Dorsal view of a Male Ephemerella dorothea infrequens (Ephemerellidae) (Pale Morning Dun) Mayfly Dun from the Madison River in Montana

This mayfly was collected from the Madison River in Montana on July 1st, 2019 and added to Troutnut.com by Troutnut on July 18th, 2019.


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Male Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Dun Pictures

Collection details
Location: Madison River, Montana
Date: July 1st, 2019
Added to site: July 18th, 2019
Author: Troutnut
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