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Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Stonefly Genus Doroneuria (Golden Stones)

This less common western genus currently has only two species. Doroneuria theodora & Doroneuria baumanni (mostly coastal)

Calineuria and Doroneuria nymphs both lack anal gills and can be confused, but Doroneuria has a ridge of fine hairs running down the center of its body dorsally and is not as dramatically marked. The adults often have very short wings and also lack the striking head markings of Calineuria. The adult males have large quadrangular hammers that are almost twice as long as wide.

Specimens of the Stonefly Genus Doroneuria

1 Nymph
Doroneuria baumanni (Golden Stone) Stonefly Nymph
I'm not aware of any way to tell the two species of Doroneuria apart as nymphs, so this one is classified to species based on location alone. Doroneuria baumanni is found in the Cascades and in Washington, and the other species is not known here yet.
1 Male Adult
Male Doroneuria baumanni (Golden Stone) Stonefly Adult
I found this stonefly on some streamside vegetation. I didn't see any in the air in several hours of fishing.

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Taxonomy
» Genus Doroneuria (Golden Stones)
Species in Doroneuria
Doroneuria baumanniGolden Stone228
1 species (Doroneuria theodora) isn't included.
Genus Range
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