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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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.

Male Eurylophella temporalis (Chocolate Dun) Mayfly Dun Pictures

I found this specimen along with a female on the surface in the shallows of a long flat in a warm-water smallmouth bass stream, during the middle of the afternoon. There were quite a few of them on the water throughout the day, but not enough to interest trout, especially since the nearest trout were several miles away in different rivers. I held on to this one for a few days hoping it would molt into a spinner for a better chance at a positive species ID, and it finally did, so this same individual is listed as a separate specimen as a spinner.

Lateral view of a Male Eurylophella temporalis (Ephemerellidae) (Chocolate Dun) Mayfly Dun from the West Fork of the Chippewa River in Wisconsin
Dorsal view of a Male Eurylophella temporalis (Ephemerellidae) (Chocolate Dun) Mayfly Dun from the West Fork of the Chippewa River in Wisconsin
Ventral view of a Male Eurylophella temporalis (Ephemerellidae) (Chocolate Dun) Mayfly Dun from the West Fork of the Chippewa River in Wisconsin
Ruler view of a Male Eurylophella temporalis (Ephemerellidae) (Chocolate Dun) Mayfly Dun from the West Fork of the Chippewa River in Wisconsin The smallest ruler marks are 1 mm.

This mayfly was collected from the West Fork of the Chippewa River in Wisconsin on June 21st, 2021 and added to Troutnut.com by Troutnut on June 24th, 2021.


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Male Eurylophella temporalis (Chocolate Dun) Mayfly Dun Pictures

Collection details
Location: West Fork of the Chippewa River, Wisconsin
Date: June 21st, 2021
Added to site: June 24th, 2021
Author: Troutnut
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