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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.

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 Callibaetis (Speckled Dun) Mayfly Spinner Pictures

This is a tricky one to ID. The forewings seem to be on the low end of the "crossvein count" key characteristic. There are paired marginal intercalaries in the middle area of the fore wing (kind of visible in photos, verified 100 % under microscope), and the wing and its veins are pale. Keys would seem to point to Callibaetis pictus in this case, but several other characteristics including size don't fit (pictus is smaller), and this is a bit out of its range.

Lateral view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Artistic view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Ruler view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin The smallest ruler marks are 1 mm.
Ventral view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Dorsal view of a Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin
I really cranked up the contrast on the wing veins because they were incredibly difficult to see otherwise.

Male Callibaetis (Baetidae) (Speckled Dun) Mayfly Spinner from the Teal River in Wisconsin

This mayfly was collected from the Teal River in Wisconsin on June 10th, 2021 and added to Troutnut.com by Troutnut on June 11th, 2021.


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Male Callibaetis (Speckled Dun) Mayfly Spinner Pictures

Collection details
Location: Teal River, Wisconsin
Date: June 10th, 2021
Added to site: June 11th, 2021
Author: Troutnut
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