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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Stenonema » Stenonema femoratum
Photo#747206
Mayfly Larvae - Stenonema femoratum
Copyright © 2013 Andrew Hoffman

Mayfly Larvae - Stenonema femoratum
Splinter Ridge FWA, Jefferson County, Indiana, USA
February 24, 2013
These mayfly larvae were found under rocks in a shallow, clear and cool, rocky ephemeral stream I was sampling. They were always found clinging to the underside of rocks. Out of 20 rocks overturned in search of invertebrates (10 in riffle habitat and 10 in pools), this species was found under five (15 individuals), all except one in pools. Some of these larvae may have been a different species in the same family (not photographed).

Images of this individual: tag all
Mayfly Larvae - Stenonema femoratum Mayfly Larvae - Stenonema femoratum
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Contributed by Andrew Hoffman on 25 February, 2013 - 12:06pm
Last updated 27 February, 2013 - 4:57pm

Moved
Moved from Flatheaded Mayflies.
… Roger Rohrbeck, 27 February, 2013 - 3:17pm login or register to post comments

Stenonema or Mccaffertium
I agree with Roger on this one. I'm leaning towards Stenonema femoratum based on the dorsal pattern (although it would be a slight aberration of the normal pattern), but the ventral color pattern doesn't match up well at all. We really need to see close-up photos of the gills, particularly the seventh (abdominal segment) gill.

Andrew, just to clarify -- are you certain that both photos are of the same specimen?
… Brady Richards, 27 February, 2013 - 11:31am login or register to post comments

 
Might have mixed them up...
Brady,

Let me look back through my photos, I think I must have put the ventral shot with the wrong individual (I caught a few of them and photographed the ventral on only one, but got the dorsal shot on multiple). I will correct it later to clear up the confusion.
… Andrew Hoffman, 27 February, 2013 - 11:47am login or register to post comments

Moved
Moved from Mayflies.
… Roger Rohrbeck, 26 February, 2013 - 1:57am login or register to post comments

Stenonema or Maccaffertium
Andrew-

I believe your nymph to be of genus Stenonema, or perhaps less likely, Maccaffertium. So, I am moving it to Heptageniidae, and will alert Brady Richards to its presence there. Hopefully, he will be able to give you a more definitive answer.
… Roger Rohrbeck, 26 February, 2013 - 1:56am login or register to post comments

 
Thanks Roger!
Thanks Roger!
… Andrew Hoffman, 26 February, 2013 - 6:47am login or register to post comments

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