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Isoperla fusca (Yellow Sally) Stonefly Nymph Pictures

 This specimen keys to Isoperla fusca using the key in Szczytko & Stewart 1979, but some species of Isoperla weren't represented there.

This stonefly was collected from the Yakima River on April 9th, 2021 and added to Troutnut.com on April 12th, 2021.

The row of stout setae along the back of the head (anterior of the occiput) on this specimen was relevant to the species ID.  Isoperla fusca (Yellow Sally) Stonefly Nymph from the Yakima River in Washington
The row of stout setae along the back of the head (anterior of the occiput) on this specimen was relevant to the species ID.

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