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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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 Cinygmula uniformis Mayfly Spinner Pictures

The identification of this specimen is not positive because some of the key characteristics conflict. The uniform amber tint of the wings and the rusty-colored mid-ventral markings on some of the abdominal sternites point to Cinygmula uniformis, but I could not locate the small ventral subapical spines on the penes that are supposed to also diagnose that species (the ones visible in the pictures aren't the ones I'm talking about). If I prioritize that characteristics, this would probably be Cinygmula mimus, but then the wing and sternite shading/markings are wrong.

Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Lateral view of a Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Ruler view of a Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Dorsal view of a Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Ventral view of a Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington
Male Cinygmula uniformis (Heptageniidae) Mayfly Spinner from the South Fork Snoqualmie River in Washington

This mayfly was collected from the South Fork Snoqualmie River in Washington on May 22nd, 2022 and added to Troutnut.com by Troutnut on May 24th, 2022.


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Male Cinygmula uniformis Mayfly Spinner Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: May 22nd, 2022
Added to site: May 24th, 2022
Author: Troutnut
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