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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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 Ironodes

This Western genus is closely related to Epeorus and its biology is similar. The only species recognized as important to fly anglers is Ironodes nitidus.

Where & when

In 10 records from GBIF, adults of this genus have been collected during June (60%), May (20%), March (10%), and July (10%).

In 5 records from GBIF, this genus has been collected at elevations ranging from 450 to 5200 ft, with an average (median) of 3600 ft.

Genus Range

Specimens of the Mayfly Genus Ironodes

1 Female Spinner

Start a Discussion of Ironodes

References

Mayfly Genus Ironodes

Genus Range
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