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 seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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Caddisfly Genus Wormaldia (Little Autumn Sedges)
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Where & when
Preferred waters: Small streams, generally in the mountains
In 205 records from GBIF, adults of this genus have mostly been collected during June (21%), May (18%), July (15%), September (13%), August (10%), October (7%), and April (7%).
In 53 records from GBIF, this genus has been collected at elevations ranging from 69 to 9318 ft, with an average (median) of 2559 ft.
Genus Range
Larva & pupa biology
Current speed: Fast
Environmental tolerance: Requires cold water
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References
- LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.
- Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.
Caddisfly Genus Wormaldia (Little Autumn Sedges)
Taxonomy
12 species (Wormaldia arizonensis, Wormaldia gesugta, Wormaldia hamata, Wormaldia lacerna, Wormaldia laona, Wormaldia mohri, Wormaldia occideus, Wormaldia oconee, Wormaldia pachita, Wormaldia shawnee, Wormaldia strotus, and Wormaldia thyria) aren't included.