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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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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 (Dark Red Quill) Mayfly Spinner Pictures

This male was collected from the same cloud of spinners as this female and is probably the same species. I'm tentatively calling them both Cinygmula for now, but I'm really not sure about that ID yet.

Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana
Lateral view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana
Dorsal view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana
Ventral view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana
Each mark on the ruler is 1/16 inch

Ruler view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana The smallest ruler marks are 1 mm.
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from Rock Creek in Montana

This mayfly was collected from Rock Creek in Montana on August 17th, 2018 and added to Troutnut.com by Troutnut on June 13th, 2019.


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Male Cinygmula (Dark Red Quill) Mayfly Spinner Pictures

Collection details
Location: Rock Creek, Montana
Date: August 17th, 2018
Added to site: June 13th, 2019
Author: Troutnut
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