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 seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.
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Stonefly Genus Mesocapnia (Little Snowflies)
Taxonomy
Species in Mesocapnia
Mesocapnia variabilisVariable Snowflies
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Species in Mesocapnia: Mesocapnia variabilis
14 species (Mesocapnia arizonensis, Mesocapnia autumna, Mesocapnia bakeri, Mesocapnia bergi, Mesocapnia bulbosa, Mesocapnia frisoni, Mesocapnia lapwae, Mesocapnia oenone, Mesocapnia ogotoruka, Mesocapnia porrecta, Mesocapnia projecta, Mesocapnia sugluka, Mesocapnia werneri, and Mesocapnia yoloensis) aren't included.