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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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Drunella grandis (Western Green Drake) Mayfly Nymph Pictures

Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Dorsal view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Ruler view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington The smallest ruler marks are 1 mm.
Ventral view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Lateral view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington

This mayfly was collected from the Dosewallips River in Washington on July 6th, 2020 and added to Troutnut.com by Troutnut on July 12th, 2020.

Discussions of this Nymph

Fearsome
1 replies
Posted by Martinlf on Aug 14, 2020
Last reply on Aug 14, 2020 by Troutnut
Love the detail here, Jason. Those spikes on the head and abdomen are cool. Horned mayfly.

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Drunella grandis (Western Green Drake) Mayfly Nymph Pictures

Collection details
Location: Dosewallips River, Washington
Date: July 6th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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