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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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Calineuria californica (Golden Stone) Stonefly Nymph Pictures

This is a difficult one. It keys convincingly to either Calineuria or Doroneuria. There is no mesal longitudinal row of silky hairs on thorax and abdominal dorsum, in either my pictures or anything I can see up close under the microscope. Lacking those hairs should indicate Calineuria. But abdominal sternum 7 has an incomplete posterior setal fringe, which would indicate Doroneuria, although the key says "usually" on that characteristic. For now I'm going with Calineuria, but it's far from certain. Maybe it's a younger Doroneuria and they don't grow that row of hairs until they're older. The markings on the head, especially the shape of the bright spot around the posterior ocelli, match online images of Calineuria californica better than Doroneuria.

Dorsal view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Ventral view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Ruler view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington The smallest ruler marks are 1 mm.
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from the Yakima River in Washington

This stonefly was collected from the Yakima River in Washington on April 24th, 2022 and added to Troutnut.com by Troutnut on April 27th, 2022.


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Calineuria californica (Golden Stone) Stonefly Nymph Pictures

Collection details
Location: Yakima River, Washington
Date: April 24th, 2022
Added to site: April 27th, 2022
Author: Troutnut
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