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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 Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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

I'm unsure of the ID on this one; keys put it closest to Cinygmula reticulata, but I'm very doubtful of the species and not positive on the genus. Epeorus is another possibility, but I don't know which species it would be.

This one was collected in association with a female dun probably of a different family.

Lateral view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Dorsal view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Ventral view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington
Ruler view of a Male Cinygmula (Heptageniidae) (Dark Red Quill) Mayfly Spinner from the South Fork Stillaguamish River in Washington The smallest ruler marks are 1/16".

This mayfly was collected from the South Fork Stillaguamish River in Washington on July 1st, 2017 and added to Troutnut.com by Troutnut on July 2nd, 2017.


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Male Cinygmula (Dark Red Quill) Mayfly Spinner Pictures

Collection details
Location: South Fork Stillaguamish River, Washington
Date: July 1st, 2017
Added to site: July 2nd, 2017
Author: Troutnut
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