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

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.

View Full SizeView Full Size and Comment (2X larger)
Add
Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
AuthorTroutnut
CameraCanon EOS 20D
View Full SizeView Full Size and Comment (2X larger)
Add
Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
AuthorTroutnut
CameraCanon EOS 20D
View Full SizeView Full Size and Comment (2X larger)
Add
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.
AuthorTroutnut
CameraCanon EOS 20D
View Full SizeView Full Size and Comment (2X larger)
Add
Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
AuthorTroutnut
CameraCanon EOS 20D
View Full SizeView Full Size and Comment (2X larger)
Add
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.
AuthorTroutnut
CameraCanon EOS 20D
View Full SizeView Full Size and Comment (2X larger)
Add
Stenonema femoratum (Cream Cahill) Mayfly Nymph from Mongaup Creek in New York
AuthorTroutnut
CameraCanon EOS 20D

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

Start a Discussion of this Nymph:

You must log in at the top of the page to post. If you haven't registered yet, it's this easy:

Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.
Top 10 Fly Hatches
BaetisBaetidaeEphemerellidaeHexagenia limbataChironomidaeHeptageniidaeEphemerella subvariaEphemerellaIsonychiaHydropsychidae
Top Gift Shop Designs
I outfish my daddy!Electric blue Hendrickson dun.I love buggers. Big, green, wooly ones.I outfish my husband!Be the trout.
Eat mayflies.
Top Insect Specimens
Baetisca obesa Mayfly NymphNeophylax Caddisfly AdultCorydalus Hellgrammite LarvaRhyacophila fuscula Caddisfly LarvaBaetis Mayfly Dun
Miscellaneous Sites
Dalton Highway (Haul Road) Corridor Map