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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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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Caddisfly Species Rhyacophila torva (Green Sedges)

Where & when

Time of year : Early June

This species is most important in the Northeast.

In 42 records from GBIF, adults of this species have mostly been collected during June (26%), May (24%), July (21%), April (10%), September (7%), and August (7%).

In 24 records from GBIF, this species has been collected at elevations ranging from 561 to 5764 ft, with an average (median) of 2625 ft.

Species Range

Start a Discussion of Rhyacophila torva

References

  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.

Caddisfly Species Rhyacophila torva (Green Sedges)

Taxonomy
Species Range
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