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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.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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 Siphlonuridae (Gray Drakes)

These large, slender mayflies have nymphs of the swimming type, like Isonychiidae and Metretopodidae, and they generally inhabit slow water. See Siphlonurus for details -- it is the only genus of known importance to anglers.

Where & when

In 251 records from GBIF, adults of this family have mostly been collected during June (49%), July (27%), May (11%), and August (10%).

In 489 records from GBIF, this family has been collected at elevations ranging from -30 to 11444 ft, with an average (median) of 810 ft.

Family Range

Identification

To determine whether a specimen of Ephemeroptera belongs to Siphlonuridae, use the Key to Families of Mayfly Nymphs or Key to Families of Mayfly Duns and Spinners.

Specimens of the Mayfly Family Siphlonuridae

2 Female Duns
5 Male Spinners
7 Female Spinners
10 Nymphs

3 Underwater Pictures of Siphlonuridae Mayflies:


Start a Discussion of Siphlonuridae

Mayfly Family Siphlonuridae (Gray Drakes)

Taxonomy
Genus in Siphlonuridae: Parameletus, Siphlonisca, Siphlonurus
1 genus (Edmundsius) isn't included.
Family Range
Common Name
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