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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
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.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Male Epeorus albertae (Pink Lady) Mayfly Spinner Pictures

Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Lateral view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Ventral view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Dorsal view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho
Ruler view of a Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho The smallest ruler marks are 1 mm.
Male Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Spinner from the Henry's Fork of the Snake River in Idaho

This mayfly was collected from the Henry's Fork of the Snake River in Idaho on August 1st, 2020 and added to Troutnut.com by Troutnut on August 18th, 2020.


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Male Epeorus albertae (Pink Lady) Mayfly Spinner Pictures

Collection details
Location: Henry's Fork of the Snake River, Idaho
Date: August 1st, 2020
Added to site: August 18th, 2020
Author: Troutnut
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