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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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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Taenionema (Willowfly) Stonefly Nymph Pictures

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.

Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Dorsal view of a Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
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.

Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Ventral view of a Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Ruler view of a Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington The smallest ruler marks are 1 mm.
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.

Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Ventral shieldlike plate on the tip of the abdomen, a key identifying characteristic.

Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington
Dorsal view of the basal cercal segments, lacking the silky setae that would have pointed to a different genus.

Taenionema (Taeniopterygidae) (Willowfly) Stonefly Nymph from Holder Creek in Washington

This stonefly was collected from Holder Creek in Washington on April 12th, 2021 and added to Troutnut.com by Troutnut on April 13th, 2021.


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Taenionema (Willowfly) Stonefly Nymph Pictures

Collection details
Location: Holder Creek, Washington
Date: April 12th, 2021
Added to site: April 13th, 2021
Author: Troutnut
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