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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Stonefly Genus Paragnetina (Golden Stones)

Paragnetina media is an important species in both the East and the Midwest, and Paragnetina immarginata is important in the East.

Where & when

In 67 records from GBIF, adults of this genus have mostly been collected during June (33%), July (24%), May (21%), August (9%), and April (6%).

In 10 records from GBIF, this genus has been collected at elevations ranging from 600 to 3802 ft, with an average (median) of 1148 ft.

Genus Range


To determine whether a specimen of Perlidae belongs to Paragnetina, use the Key to Genera of Perlidae Nymphs.

Specimens of the Stonefly Genus Paragnetina

1 Male Adult
2 Female Adults
3 Nymphs

Start a Discussion of Paragnetina

Stonefly Genus Paragnetina (Golden Stones)

3 species (Paragnetina fumosa, Paragnetina ichusa, and Paragnetina kansensis) aren't included.
Genus Range
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