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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.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Armored Mayflies

This common name refers to only one family. Click its scientific name to learn more.

Mayfly Family Baetiscidae

These are pretty much always called Armored Mayflies.
The mayflies of this family are known mostly for their curious shapes, but they can create excellent spinner falls, too. Read about Baetisca, the only genus in this family, for details.
Artistic view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Dun from the Marengo River in Wisconsin
Lateral view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin

Armored Mayflies

Scientific Name
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