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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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.

Calineuria californica (Golden Stone) Stonefly Nymph Pictures

This striking golden stonefly is the first of its species I've had the chance to photograph.

Ruler view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington The smallest ruler marks are 1 mm.
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Dorsal view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Ventral view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
The transverse row of spinules on the occiput (little spikes along the back of the head) is an identifying characteristic clearly visible here. This row is "irregular" and "sinuate."

Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Lateral view of a Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington
The spiky brown hairs sticking up from the tergites are the "intercalary bristles" mentioned in the key.

Calineuria californica (Perlidae) (Golden Stone) Stonefly Nymph from Holder Creek in Washington

This stonefly was collected from Holder Creek in Washington on April 12th, 2021 and added to Troutnut.com by Troutnut on April 13th, 2021.


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Calineuria californica (Golden Stone) Stonefly Nymph Pictures

Collection details
Location: Holder Creek, Washington
Date: April 12th, 2021
Added to site: April 13th, 2021
Author: Troutnut
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