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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 Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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

This spinner appeared inside our car after a rest stop overlooking the Snake, so that's most likely where it came from. Two different keys place it firmly in Epeorus albertae.

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

This mayfly was collected from the Snake River in Idaho on August 23rd, 2020 and added to Troutnut.com by Troutnut on September 18th, 2020.


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Male Epeorus albertae (Pink Lady) Mayfly Spinner Pictures

Collection details
Location: Snake River, Idaho
Date: August 23rd, 2020
Added to site: September 18th, 2020
Author: Troutnut
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