Yellow Sallflies

Mayflies

Caddisflies

Stoneflies

Scientific Name

Match	Scientific Name
	Suwallia pallidula

This common name refers to only one species.

Stonefly Species Suwallia pallidula

These are sometimes called Yellow Sallflies.

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.

Suwallia 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 in
Added to Troutnut.com by on July 30, 2019

Suwallia pallidula (Sallfly) Stonefly Adult

View 2 Pictures

Collected July 1, 2011 from in
Added to Troutnut.com by on July 1, 2011

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Jargon Defined:

Apical: Close to the apex; tip or end.

Distal: Far from the point of attachment or origin; near the tip.

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Posterior: Toward the back of an organism's body. The phrase "posterior to" means "in back of."