Blue-winged Olives
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.
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This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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Stonefly Genus Acroneuria (Golden Stones)
This abundant genus has three important East/Midwest species. The superabundant species in the West have been moved to the new genera Calineuria and Hesperoperla.
Genus Range
Identification
To determine whether a specimen of Perlidae belongs to Acroneuria, use the Key to Genera of Perlidae Nymphs.
Specimens of the Stonefly Genus Acroneuria
1 Female Adult
6 Nymphs
The presence of anal gills, large dark spot in the center of the pale occipital bar point to lycorias.
Start a Discussion of Acroneuria
References
- Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.
Stonefly Genus Acroneuria (Golden Stones)
Taxonomy
Species in Acroneuria
Acroneuria abnormisCommon Stone
3
32
Acroneuria arenosaEastern Stone
0
0
Acroneuria carolinensisCarolina Stoneflies
1
3
Acroneuria kosztarabiVirginia Stone
0
0
Acroneuria lycoriasBoreal Stoneflies
3
29
Species in Acroneuria: Acroneuria abnormis, Acroneuria arenosa, Acroneuria carolinensis, Acroneuria kosztarabi, Acroneuria lycorias
10 species (Acroneuria arida, Acroneuria evoluta, Acroneuria filicis, Acroneuria flinti, Acroneuria frisoni, Acroneuria hitchcocki, Acroneuria internata, Acroneuria ozarkensis, Acroneuria perplexa, and Acroneuria petersi) aren't included.