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Stonefly Species Suwallia pallidula (Sallfly)

Pictures Below ↓
This species was formerly classified as Alloperla pallidula.

In my experience, most of my mid-summer collections of small yellow Chloroperlids in the northwest have keyed out to this species.  

Where & When


Region: West

This yellow species is regarded as common.

Suwallia pallidula Fly Fishing Tips


I've found trout eager to hit small yellow sally dry flies at these times, although I think they were just being opportunistic. I haven't seen enough of these flies on the water to make the trout selective, but it might be worth considering an imitation when fishing to wary trout that are more likely to hit familiar-looking food than random attractors (Attractor: Flies not designed to imitate any particular insect, but to incorporate characteristics attractive to trout. When trout aren't feeding selectively, attractors often outperform careful imitations as searching patterns because they are easier to see and incorporate more strike-triggering characteristics. They include legends like the Adams, Bivisible, and Royal Wulff.).


Pictures of 5 Stonefly Specimens in the Species Suwallia pallidula:

Specimen Page:12
Suwallia pallidula (Sallfly) Stonefly AdultSuwallia pallidula (Sallfly) Stonefly Adult View 2 Pictures
Collected July 1, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on July 1, 2011
Suwallia pallidula (Sallfly) Stonefly NymphSuwallia pallidula (Sallfly) Stonefly Nymph View 6 PicturesThis specimen keys out to Suwallia, for which I did not find any nymph species keys. However, I'm placing it in Suwallia pallidula because I caught a few adults in the same spot that closely resembled the abundant nymphs and keyed them out to species. Features I noted under the microscope when keying this specimen to genus included apical (Apical: Close to the apex; tip or end.) hairs of cercal segments that were directed at posterior (Posterior: Toward the back of an organism's body. The phrase "posterior to" means "in back of.") angles, and the longest apical (Apical: Close to the apex; tip or end.) hairs of distal (Distal: Far from the point of attachment or origin; near the tip.) segments were shorter than their following segment.
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Female Suwallia pallidula (Sallfly) Stonefly AdultFemale Suwallia pallidula (Sallfly) Stonefly Adult View 9 PicturesI collected a few of these throughout the afternoon. The positive ID on the adults allowed me to also put a species ID on the nymphs.
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 29, 2019
Specimen Page:12

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