**Stonefly Species Isoperla fusca (Yellow Sally)**

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Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Plecoptera (Stoneflies)

» Family Perlodidae (Springflies and Yellow Stones)

» Genus Isoperla (Stripetails and Yellow Stones)

» Species fusca (Yellow Sally)

Common Name

Match	Common Name
	Yellow Sally

Pictures Below ↓

Pictures of 2 Stonefly Specimens in the Species Isoperla fusca:

Female Isoperla fusca (Yellow Sally) Stonefly Adult

View 13 PicturesThe family ID on this one was a little bit tricky. Just going by the size, shape, and color, it looks like Chloroperlidae. However, the second anal vein of the forewing is does not appear to be forked, and the apical (Apical: Close to the apex; tip or end.) maxillary palpal segment is close to the length of the penultimate segment, both of which rule out that family. The position of the cubitoanal crossvein (Crossvein: Short cross-wise veins in an insect wing which connect the long longitudinal (length-wise) veins.) relative to the anal cell in the forewing -- touching it in this case -- indicates Perlidae (and it really doesn't have the "look" of Perlidae at all), but other characteristics, such as the metathorastic sternacostal sutures and lack of gill remnants, point to Perlodidae. That's the right answer. Moving on to Perlodidae, the key characteristics in Merritt & Cummins lead straightforwarly to Isoperla, and the species key in Jewett 1959 (The Stoneflies of the Pacific Northwest) leads to Isoperla fusca.

There is one caveat: That source does suggest a May-July emergence, whereas this one was collected in mid-September.

Collected September 17, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020

Isoperla fusca (Yellow Sally) Stonefly Nymph

View 12 PicturesThis specimen keys to Isoperla fusca using the key in Szczytko & Stewart 1979, but some species of Isoperla weren't represented there.

Collected April 9, 2021 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on April 12, 2021

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Stonefly Species Isoperla fusca (Yellow Sally)

Pictures of 2 Stonefly Specimens in the Species Isoperla fusca:

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**Stonefly Species Isoperla fusca (Yellow Sally)**