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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.

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 Ecdyonurus (Western Ginger Quills)

This fairly new genus holds some Western species that used to be in Nixe and were in Heptagenia before that. They are mentioned in books by those generic names. Ecdyonurus simpliciodes is especially important.

Where & when

In 39 records from GBIF, adults of this genus have mostly been collected during September (28%), July (28%), August (18%), October (10%), and June (10%).

In 33 records from GBIF, this genus has been collected at elevations ranging from 1450 to 9318 ft, with an average (median) of 5489 ft.

Genus Range

Hatching behavior

These species hatch in or near the surface in calm water. Emergence is quite fast, but the duns may drift a while.

Spinner behavior

Time of day: Dusk

Habitat: Riffles

The female spinners oviposit by flying over the water and dropping down to the surface to release some eggs, then taking off to do it again. They eventually fall spent.

Specimens of the Mayfly Genus Ecdyonurus

1 Male Spinner
1 Female Spinner
1 Nymph

Start a Discussion of Ecdyonurus


Mayfly Genus Ecdyonurus (Western Ginger Quills)

Genus Range
Common Name
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