Mayfly hatch in aquarium - Leptophlebiidae?

LowBudget has attached these 3 pictures to aid in identification. The message is below.

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Body length (excluding tail) is 10 mm.

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The coloration of the dun's wings gets left behind in its exuvia.
The background for this image is a blue post-it note.

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Adult/spinner

LowBudget	April 12th, 2014, 8:16 am
Afton, NY Posts: 25	I had a couple of mayflies hatch in an aquarium. I had thought that I only had some stoneflies and beetle larvae in it but lo and behold..... Any help in identifying these would be appreciated. The larvae were collected from Trout Creek, a tributary of the West Branch of the Delaware River, located in Delaware County, New York. Thank you Ed
	Ed Low Budget Fly Tying and Fishing author of "Behind the Fly" http://edengelman.com/BTF.html

LowBudget	April 12th, 2014, 2:16 pm
Afton, NY Posts: 25	I have also posted the images on a Flickr page https://www.flickr.com/photos/107447394@N07/sets/72157643851914463/ Ed
	Ed Low Budget Fly Tying and Fishing author of "Behind the Fly" http://edengelman.com/BTF.html

Crepuscular	April 12th, 2014, 4:29 pm
Boiling Springs, PA Posts: 919	Looks like a female Ephemerella subvaria to me. Although 10mm is a little small.

LowBudget	April 12th, 2014, 8:09 pm
Afton, NY Posts: 25	Thank you Ed
	Ed Low Budget Fly Tying and Fishing author of "Behind the Fly" http://edengelman.com/BTF.html

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