**Male Ephemerella aurivillii Mayfly Spinner Pictures**

Mayflies

Caddisflies

Stoneflies

Classification

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)

» Genus Ephemerella (Hendricksons, Sulphurs, PMDs)

» Species aurivillii

This spinner molted from a dun after being photographed, and the dun form is listed here as a separate specimen. I've rarely found a more cooperative and photogenic mayfly.

This mayfly was collected from Nome Creek on July 10th, 2011 and added to Troutnut.com on July 16th, 2011.

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Male Ephemerella aurivillii Mayfly Spinner from Nome Creek in Alaska

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Here's the skin the dun shed as it molted into this spinner.

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Recent Discussions of this Spinner

This is one of my favorite mayfly photo sets 10 Replies »

Posted by Troutnut on Jul 16, 2011

Last reply on Jul 17, 2011 by Oldredbarn

Gotta love Ephemerella spinners! I was thrilled that this one emerged and molted intact, and then behaved so well in front of the camera.

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Jargon Defined:

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.