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> > Which Heptageniidae species is this?

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Late Season spinner (Upper Midwest)
Late Season spinner (Upper Midwest)
WiflyfisherJuly 12th, 2008, 2:30 pm
Wisconsin

Posts: 612
I know this is probably a late season spinner, but I am not sure which Heptageniidae genus and species this would be?
John S.
https://WiFlyFisher.com
GONZOJuly 12th, 2008, 2:58 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
John,

It might be Stenonema femoratum, the last remaining North American species in that genus after the others were moved into Maccaffertium. It's hard to say anything really definitive about many Light Cahill/Cream Cahill females because so many of them haven't been associated in a conclusive way. The things that suggest femoratum are the crowded cross-veins near the bulla region of the forewing and the markings on the back (tergites). Still, some of the Maccaffertium also have crowded cross-veins, and I can't see enough of the back markings to be sure they match. (In femoratum, the markings are described as a central dot with a dash on either side of it.)
WiflyfisherJuly 14th, 2008, 5:37 pm
Wisconsin

Posts: 612
the last remaining North American species


May Stenonema remain forever in the halls of Mayfly entomology! :)

Gonzo, thanks! If I get a some free time (and I can find it) I will try to post a closer shot that I took.
John S.
https://WiFlyFisher.com

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