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.
This stonefly was collected from Holder Creek on April 12th, 2021 and added to Troutnut.com on April 13th, 2021.
The second tarsal segment here is a bit longer than the first rather than much shorter, which distinguishes this specimen as Taeniopterygidae instead of Nemouridae.
Hind tarsus. The second segment is longer than the first, ruling out the most obvious guess at this one's family (Nemouridae) and pointing instead to the correct ID of Taeniopterygidae.
Ventral shieldlike plate on the tip of the abdomen, a key identifying characteristic.
Dorsal view of the basal cercal segments, lacking the silky setae that would have pointed to a different genus.
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