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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.

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.

Mayfly Genus Acerpenna (Tiny Blue-Winged Olives)

See Acerpenna pygmaea for details. It is the only species known to be of even minor importance to anglers and was previously known as Baetis pygmaeus.

Where & when

In 38 records from GBIF, adults of this genus have been collected during July (37%), June (26%), May (18%), April (8%), September (5%), and August (5%).

In 52 records from GBIF, this genus has been collected at elevations ranging from 3 to 4692 ft, with an average (median) of 1713 ft.

Genus Range

Specimens of the Mayfly Genus Acerpenna

2 Male Spinners
2 Female Spinners
1 Nymph

Start a Discussion of Acerpenna

Mayfly Genus Acerpenna (Tiny Blue-Winged Olives)

Taxonomy
3 species (Acerpenna macdunnoughi, Acerpenna sulfurosa, and Acerpenna thermophilos) aren't included.
Genus Range
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