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.

Neversink Gorge (Wolf Brook) in New York

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 in Washington

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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!