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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Stenonema » Stenonema femoratum
Photo#250236
Flatheaded Mayfly - Stenonema femoratum
Copyright © 2009 Stephen Luk

Flatheaded Mayfly - Stenonema femoratum
Eramosa River, Guelph, Wellington, Ontario, Canada
January 13, 2009
Size: 12 mm
In detritus. Size measurement excludes cerci. I think Stenonema sp.
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Contributed by Stephen Luk on 24 January, 2009 - 3:08pm
Last updated 26 January, 2009 - 10:58pm

A nymph
A nymph for S. femoratum. Thanks Lloyd!
… Stephen Luk, 26 January, 2009 - 10:58pm login or register to post comments

Stenonema femoratum
The distinctive dorsal abdominal color pattern with pale areas on Ab5 and Ab8-9 is typical of this species. Unlike the former members of Stenonema that are now Maccaffertium, S. femoratum has rounded (rather than truncate) apices on gills 1-6. This species is now the only representative of the genus. (S. tripunctatum is a synonym found in older references.)
… Lloyd Gonzales, 26 January, 2009 - 10:42pm login or register to post comments

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