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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 Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph Pictures

Ventral view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Dorsal view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Lateral view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin

This mayfly was collected from the Namekagon River in Wisconsin on May 28th, 2005 and added to Troutnut.com by Troutnut on May 24th, 2006.


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Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph Pictures

Collection details
Location: Namekagon River, Wisconsin
Date: May 28th, 2005
Added to site: May 24th, 2006
Author: Troutnut
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