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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Stoneflies (Plecoptera) » Small Winter Stoneflies (Capniidae) » Allocapnia
Photo#250703
Stonefly Nymph - Allocapnia - male
Copyright © 2009 Stephen Luk

Stonefly Nymph - Allocapnia - Male
Eramosa River, Guelph, Wellington, Ontario, Canada
January 13, 2009
Size: 6 mm
In detritus. Size measurement excludes cerci. I suspect Leuctridae.
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Contributed by Stephen Luk on 27 January, 2009 - 9:58am
Last updated 16 February, 2009 - 10:55am

Moved
Moved from Small Winter Stoneflies.
… Stephen Luk, 16 February, 2009 - 10:55am login or register to post comments

Moved
Moved from Rolled-winged Stoneflies.
… Stephen Luk, 2 February, 2009 - 9:11am login or register to post comments

 
Looking
at bunches of Allocapnia now - I would say this is a male Allocapnia (females would lack the prominent epiproct, as would the leuctrids). Without the specimen, only an extremely knowledgeable specialist could go further.
… Donald S. Chandler, 15 February, 2009 - 3:17pm login or register to post comments

I would
go with Capniidae myself. The time of year is certainly correct (though there are a few winter active Leuctrids), but the prominent epiproct seen above at the end of the abdomen is not found in Leuctidae, and is typical of Allocapnia, which would be my placement. While the keys always natter on about the pleural folds, I have always found them hard to see and count when looking at leuctrids.
… Donald S. Chandler, 1 February, 2009 - 6:51pm login or register to post comments

Scoped...
Definitely a Leuctrid.
… Stephen Luk, 30 January, 2009 - 10:06am login or register to post comments

Leuctridae and Capniidae nymphs...
can be a bit difficult to distinguish in dorsal photographs. If you have the specimen, check the length of the pleural fold along the side of the abdomen. In Capniidae, the fold will extend nearly the length of the abdomen (Ab9). In Leuctridae, it will be shorter (Ab7 at most). Check this fold in your other specimen as well (250702).
… Lloyd Gonzales, 28 January, 2009 - 8:14am login or register to post comments

 
Okay, thanks.
I'll scope it in the next few days and let you know what I see.
… Stephen Luk, 28 January, 2009 - 10:05am login or register to post comments

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