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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.

Female Leucrocuta hebe (Little Yellow Quill) Mayfly Dun Pictures

I found this dun on the same piece of stream as a similar spinner, probably of the same species.

This mayfly was collected from Mystery Creek #43 in New York on September 19th, 2006 and added to Troutnut.com by Troutnut on October 4th, 2006.

Discussions of this Dun

Looks like Leucrocuta
Posted by GONZO on Oct 6, 2006
Last reply on Oct 6, 2006 by GONZO
Haven't checked any keys to verify, but most of the little late-season Cahill-looking duns are Leucrocuta. If I had to guess at the species, I'd say hebe (Little Yellow Quill). It is probably the most common L. spp. in the East and has a long hatching period that extends well into the fall.

I would also agree that the spinner you photographed is the same species.

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