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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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Male Cinygma dimicki (Western Light Cahill) Mayfly Spinner Pictures

I found a couple small (one or two dozen flies) clouds of these male spinners dancing low over the riffly parts of a pool in this fast river draining out of the Cascades.

Lateral view of a Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Dorsal view of a Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Ruler view of a Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington The smallest ruler marks are 1 mm.
Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Ventral view of a Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington
Male Cinygma dimicki (Heptageniidae) (Western Light Cahill) Mayfly Spinner from the Cedar River in Washington

This mayfly was collected from the Cedar River in Washington on June 30th, 2021 and added to Troutnut.com by Troutnut on July 2nd, 2021.


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Male Cinygma dimicki (Western Light Cahill) Mayfly Spinner Pictures

Collection details
Location: Cedar River, Washington
Date: June 30th, 2021
Added to site: July 2nd, 2021
Author: Troutnut
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