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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.

Mayfly Species Rhithrogena virilis

Specimens of the Mayfly Species Rhithrogena virilis

2 Male Spinners
1 Spinner
Rhithrogena virilis  Mayfly Spinner
Before I reared this specimen the nymphs were unknown. See Western North American Naturalist for the paper on the description of this species' nymph.
1 Female Dun
Female Rhithrogena virilis  Mayfly Dun
I'm guessing this one is Rhithrogena virilis based on collection of a male spinner of similar size and body configuration during the same trip.
2 Nymphs

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References

  • Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.
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