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Orvisman has attached this picture to aid in identification. The message is below.
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OrvismanAugust 23rd, 2018, 11:20 pm
Posts: 1I found this spinner near my work at a wastewater treatment plant. It's about 1km from a fairly slow large river. It’s body is about 13mm in length, and looks to be from the family heptageniidae. Is it from the genus heptagenia? Picture was taken close to Edmonton Alberta Canada.

Thank you
MartinlfAugust 26th, 2018, 5:22 am
Moderator
Palmyra PA

Posts: 2835
Thanks for posting. I wish I knew enough to say, but one of our bug experts should eventually get around to taking a look. Heptagenia seems like a likely genus to me, anyway: two tails, dark veins in the wings. Good photo, with plenty of detail!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

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