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.
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This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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Stonefly Genus Taenionema (Willowflies)
Genus Range
Specimens of the Stonefly Genus Taenionema
1 Adult
1 Male Adult
2 Nymphs
This specimen was the only one of its kind in my kick net sample from this small creek. At first I thought it was Nemouridae, but it's not. Unfortunately, there is no species key available for Taenionema nymphs. Potential species found in Washington include nigripenne, oregonense, pacificum, and pallidum.
Start a Discussion of Taenionema
Stonefly Genus Taenionema (Willowflies)
Taxonomy
Species in Taenionema
Taenionema atlanticumAtlantic Willowflies
1
8
Taenionema pacificumPacific Willowflies
2
4
Taenionema umatillaUmatilla Willowflies
0
0
9 species (Taenionema californicum, Taenionema grinnelli, Taenionema jacobii, Taenionema jewetti, Taenionema kincaidi, Taenionema oregonense, Taenionema pallidum, Taenionema raynorium, and Taenionema uinta) aren't included.