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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.
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Mayfly Genus Heterocloeon (Tiny Blue-Winged Olives)

Heterocloeon is one of two genera along with Acentrella that can be differentiated from other baetids by the presence of a conical mesonotal projection. All but one species of this genus can be further separated from Acentrella by the lack of venation in the tiny hindwings. There is little evidence that the species of Heterocloeon are of much significance to anglers.

Where & when

In 8 records from GBIF, adults of this genus have been collected during July (38%), August (25%), June (13%), September (13%), and April (13%).

In 6 records from GBIF, this genus has been collected at elevations ranging from 440 to 2690 ft, with an average (median) of 981 ft.

Genus Range

Start a Discussion of Heterocloeon

Mayfly Genus Heterocloeon (Tiny Blue-Winged Olives)

8 species (Heterocloeon anoki, Heterocloeon berneri, Heterocloeon berneri, Heterocloeon davidi, Heterocloeon grande, Heterocloeon petersi, Heterocloeon petersi, and Heterocloeon rubrolaterale) aren't included.
Genus Range
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