Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > Which Heptageniidae species is this?

Wiflyfisher has attached this picture to aid in identification. The message is below.
Shown Full Size
Late Season spinner (Upper Midwest)
Late Season spinner (Upper Midwest)
WiflyfisherJuly 12th, 2008, 2:30 pm

Posts: 663
I know this is probably a late season spinner, but I am not sure which Heptageniidae genus and species this would be?
John S.
GONZOJuly 12th, 2008, 2:58 pm
Site Editor
"Bear Swamp," PA

Posts: 1681

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

Posts: 663
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.

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: I.D. my passenger please
In the Photography Board by Flatstick96
5Apr 10, 2010
by Taxon
Re: Not Stenonema femoratum
In Stenonema femoratum Mayfly Nymph by Dewalt
4Jun 12, 2013
by Entoman
Re: Finally my "Stenonema" section isn't empty
In Stenonema femoratum Mayfly Nymph by Troutnut
2May 20, 2007
by Troutnut
Re: Unidentified Mayfly Kansas City, MO
In the Identify This! Board by Pdcox
4Apr 16, 2020
by Taxon
Re: Stenonema femoratum male spinner
In the Mayfly Genus Stenonema by Jmw975
3May 21, 2012
by Entoman
Re: A few bugs from the Kinderhook Creek (NY)
In the Identify This! Board by Agresens
3Jun 27, 2018
by Konchu
Re: Not sure what this is...
In the Photography Board by Freepow
3Jun 6, 2008
by Freepow
Re: Size Variation in March Browns
In the Identify This! Board by Fishskicano
5May 20, 2009
Re: Perlid identification assistance request
In the Identify This! Board by Tsali
9Jun 17, 2015
by Oldredbarn
Re: maccafertium?
In the Identify This! Board by Dryfly
17Jun 2, 2007
by Dryfly