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Blue-winged Olives

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 Genus Heptagenia

This is page 352 of specimens of Heptagenia. Visit the main Heptagenia page for:

  • The behavior and habitat of Heptagenia.

Specimens of the Mayfly Genus Heptagenia

5 Nymphs
1 Male Dun
Male Heptagenia culacantha  Mayfly Dun
Hyun Kounne generously provided photos of the striking, hard-to-find Heptagenia culacantha from the mainstem Delaware River. She mentioned it was one of maybe half a dozen she saw on the water that day.
1 Adult
Heptagenia solitaria (Gray Fox) Mayfly Adult
This species is common in the Flathead River below Kerr Day. The river here is fairly warm with a cobble and boulder bottom with heavy periphyton at times. This species is not common elsewhere in western Montana.
4 Male Spinners


Species in Heptagenia
Heptagenia adaequata22
Heptagenia culacantha24
Heptagenia diabasia00
Heptagenia elegantulaPale Evening Dun16
Heptagenia pullaGolden Dun324
Heptagenia solitariaGray Fox38
6 species (Heptagenia dolosa, Heptagenia flavascens, Heptagenia julia, Heptagenia marginalis, Heptagenia patoka, and Heptagenia townesi) aren't included.
Genus Range
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