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The Specimen

Epeorus (Little Maryatts) Mayfly DunEpeorus (Little Maryatts) Mayfly Dun View 12 PicturesI hoped this dun would molt into a spinner for a positive ID, but it didn't. My best guess is Epeorus dulciana, but that's only because that's the smallest western Epeorus species, and this specimen is smaller than any of the others, with a body length of 5.3 mm (although it would be longer as a spinner) and a wing length of 8.5 mm.

It was collected at the same time as a similar-sized female dun.
Collected July 5, 2017 from the South Fork Sauk River in Washington
Added to Troutnut.com by on July 6, 2017

The Discussion

TroutnutJuly 6th, 2017, 5:49 pm
Administrator
Bellevue, WA

Posts: 2558
See the caption for the specimen -- I'm thinking Epeorus dulciana based on size and geographic distribution alone, but I can't find any information about how their duns look. Pretty mayfly, though!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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