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.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

Stream photos

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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

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.

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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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What kind of aquatic bug is this?

Ihunta
Virginia

Posts: 2

Ihunta on Feb 17, 2018February 17th, 2018, 9:53 am EST

Found this in SW VA stream that's cold and clean. It was under cobbles in a lotic erosional zone, and had gills on 4 or 5 of its abdominal segments.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 17, 2018February 17th, 2018, 12:21 pm EST

It's a burrowing mayfly, probably either a member of the family Ephemeridae or Potamanthidae.

https://bugguide.net/node/view/614206

https://bugguide.net/node/view/182024/bgimage

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Ihunta
Virginia

Posts: 2

Ihunta on Feb 17, 2018February 17th, 2018, 12:39 pm EST

Ohh, that makes sense with the 3 cerci and the "horns". The multiple tarsal claws and overall size tripped me up, but I'm glad I found one before the lab practical exam!