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

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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

Brookyman	April 13th, 2014, 1:39 am
Banned Posts: 797	Great pictures Look like a female Ephemerella subvaria to me. I second that call. On second though it does look like my E invaria but it is to soon for them. But because you tank hatched it your tanks water temperature is going to be warmer that the stream so that would accelerate the nymph's development. The head marking match my Ephemerella invaria samples I tank reared last year. They also look a lot like this one. But then again look how much darker your legs are as compared to this one. Mack.
	Banned for threatening another user and then trying to circumvent a kinder "soft" ban with fake accounts

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