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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.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
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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Stonefly Family Leuctridae (Needleflies)

Leuctra is the only genus of any known importance to trout anglers. Their wings are rolled to a needle-like point; hence the common name, needle flies.

Where & when

In 70 records from GBIF, adults of this family have mostly been collected during June (21%), March (20%), February (14%), April (11%), May (11%), August (10%), and July (6%).

In 12 records from GBIF, this family has been collected at elevations ranging from 52 to 4203 ft, with an average (median) of 2559 ft.

Family Range

Specimens of the Stonefly Family Leuctridae

4 Adults

Start a Discussion of Leuctridae


Stonefly Family Leuctridae (Needleflies)

2 genera (Despaxia and Pomoleuctra) aren't included.
Family Range
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