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Stenonema femoratum (Cream Cahill) Mayfly Nymph Pictures

This mayfly was collected from Mongaup Creek on May 6th, 2007 and added to Troutnut.com on May 18th, 2007.

This is the picture that shows why this is Stenonema instead of Maccaffertium.  The main gills are rounded rather than truncate (square-ish) and the last, thread-like pair of gills is visibly tracheated (that little stripe through the center).  Those characteristics distinguish Stenonema femoratum.  Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
This is the picture that shows why this is Stenonema instead of Maccaffertium. The main gills are rounded rather than truncate (square-ish) and the last, thread-like pair of gills is visibly tracheated (that little stripe through the center). Those characteristics distinguish Stenonema femoratum.
This one had a hitchhiker I didn't notice at first.  Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
This one had a hitchhiker I didn't notice at first.

Recent Discussions of this Nymph

Not Stenonema femoratum 4 Replies »
Posted by Dewalt on Jun 12, 2013
Last reply on Jun 12, 2013 by Entoman
Only Stenonema left in North America (after taxonomic revision) is S. femoratum. The underside of the abdomen has rows of roundish dark spots at the lateral margins. This one does not.
ReplyFinally my "Stenonema" section isn't empty 2 Replies »
Posted by Troutnut on May 18, 2007
Last reply on May 20, 2007 by Troutnut
I've been looking for one of these for a while. After I realized that everything I was calling Stenonema had been renamed to Maccaffertium, the section for this once-popular genus was empty. Now with this one from a small stream in the Catskills I'm pretty sure I've got an actual Stenonema again.

I would welcome a verification from those of you with more entomological training, but it looks right to me.
Reply

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