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Photo#264265
Net-spinning Caddisfly - Arctopsyche grandis
Copyright © 2009 Tim Loh

Net-spinning Caddisfly - Arctopsyche grandis
Bow River, Calgary, Alberta, Canada
April 6, 2009
Size: 18 mm
Underside of head capsule showing the parallel median ventral plate dividing the gena (key diagnostic character).

Images of this individual: tag all
Net-spinning Caddisfly - Arctopsyche grandis Net-spinning Caddisfly - Arctopsyche grandis Net-spinning Caddisfly - Arctopsyche grandis Net-spinning Caddisfly - Arctopsyche grandis
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Contributed by Tim Loh on 8 April, 2009 - 1:23am
Last updated 6 January, 2010 - 3:24am

Comments

Moved
Moved from Arctopsyche.
… Tim Loh, 6 January, 2010 - 3:24am login or register to post comments

Moved
Moved from Parapsyche.
… Tim Loh, 12 April, 2009 - 11:28am login or register to post comments

Tim...
might you be misinterpreting the ventral apotome of the specimens that you have identified as Parapsyche? Parapsyche usually has a distinctly rectangular shape where the apotome meets the rear of the head. Although the sides of the genae do look fairly parallel in your specimens, they also appear to narrow posteriorly.

I would guess that these are Arctopsyche. The most convincing reason is that Parapsyche has hairy tufts at the sa2 and sa3 positions of most tergites. You can see these clearly on Donald's specimen of Parapsyche apicalis. I cannot find these in your specimens.
… Lloyd Gonzales, 12 April, 2009 - 11:16am login or register to post comments

 
Thanks Lloyd
I recently collected a large specimen which I identified positively as Parapsyche (the big greenish one pictured)- after comparing both specimens, this may be an Arctopsyche after all.
… Tim Loh, 12 April, 2009 - 11:27am login or register to post comments

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