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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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 Family Palingeniidae

This family contains a single genus, Pentagenia, with two species. They are large mayflies with burrowing nymphs, similar to brown and eastern green drakes (Ephemera) and Hexagenia, but they are not found on trout streams in adequate numbers to be important to anglers.

Where & when

In 70 records from GBIF, adults of this family have mostly been collected during June (39%), July (21%), August (20%), September (10%), and May (6%).

In 10 records from GBIF, this family has been collected at elevations ranging from 823 to 6247 ft, with an average (median) of 3576 ft.

Family Range

Start a Discussion of Palingeniidae

Mayfly Family Palingeniidae

Taxonomy
Genus in Palingeniidae
Pentagenia
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Genus in Palingeniidae: Pentagenia
Family Range
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