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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 Epeorus pleuralis (Quill Gordon) Mayfly Spinner Pictures

I collected a female dun on the same day that probably belongs to the same species as this spinner. It keys pretty clearly to Epeorus pleuralis among the species given in the key in Taxonomy of Epeorus Frisoni (burks) And a Key to New England Species Of Epeorus.

Lateral view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Artistic view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
The body length is about 9.5 mm. Wings probably 8.5-9 mm.

Ruler view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York The smallest ruler marks are 1 mm.
Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
This dorsal view actually give a better view of the genitalia for identification than the ventral closeup.

Dorsal view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Ventral view of a Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York
Male Epeorus pleuralis (Heptageniidae) (Quill Gordon) Mayfly Spinner from Enfield Creek in Treman Park in New York

This mayfly was collected from Enfield Creek in Treman Park in New York on May 15th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.


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Male Epeorus pleuralis (Quill Gordon) Mayfly Spinner Pictures

Collection details
Location: Enfield Creek in Treman Park, New York
Date: May 15th, 2007
Added to site: May 18th, 2007
Author: Troutnut
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