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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 Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington
This species was fairly abundant in a February sample of the upper Yakima.
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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Mayfly Family Arthropleidae

Where & when

In 11 records from GBIF, adults of this family have been collected during June (45%), July (27%), and May (27%).

Family Range

Start a Discussion of Arthropleidae

Mayfly Family Arthropleidae

Taxonomy
1 genus (Arthroplea) isn't included.
Family Range
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