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 specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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Stonefly Genus Taeniopteryx (Early Black Stoneflies)
Several species of early black stoneflies may be important, but Taeniopteryx nivalis is the most common.
Where & when
In 254 records from GBIF, adults of this genus have mostly been collected during March (35%), February (24%), January (20%), April (12%), and December (6%).
In 24 records from GBIF, this genus has been collected at elevations ranging from 180 to 11430 ft, with an average (median) of 2756 ft.
Genus Range
Specimens of the Stonefly Genus Taeniopteryx
5 Nymphs
I found this nymph wriggling in the surface film during a hatch of related Strophopteryx adults. This nymph died in transport so it's not alive in the photos, but it's pretty close to its live colors.
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References
- Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.
- Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.
Stonefly Genus Taeniopteryx (Early Black Stoneflies)
Taxonomy
Species in Taeniopteryx
Taeniopteryx nivalisBoreal Willowflies
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Species in Taeniopteryx: Taeniopteryx nivalis
10 species (Taeniopteryx burksi, Taeniopteryx lita, Taeniopteryx lonicera, Taeniopteryx maura, Taeniopteryx metequi, Taeniopteryx nelsoni, Taeniopteryx parvula, Taeniopteryx robinae, Taeniopteryx starki, and Taeniopteryx ugola) aren't included.