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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 Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington
This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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 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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