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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Alderflies, Dobsonflies, and Fishflies (Megaloptera) » Dobsonflies and Fishflies (Corydalidae) » Fishflies (Chauliodinae) » Dark Fishflies (Nigronia)
Photo#263179
Eastern Dobsonfly - Nigronia
Copyright © 2009 tom murray

Eastern Dobsonfly - Nigronia
Ashby, Middlesex County, Massachusetts, USA
April 2, 2009
Size: 15mm

Images of this individual: tag all
Eastern Dobsonfly - Nigronia Eastern Dobsonfly - Nigronia
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Contributed by tom murray on 4 April, 2009 - 12:05am
Last updated 4 April, 2009 - 11:59am

Moved
Moved from Eastern Dobsonfly.
… tom murray, 4 April, 2009 - 11:59am login or register to post comments

Are you sure?
This looks more like Nigronia to me.
… Lloyd Gonzales, 4 April, 2009 - 10:48am login or register to post comments

 
rationale
it seems to have 5-segmented antennae and the basal lateral margins of the gena (cheek) are angulate, both traits consistent with Corydalus in the keys.
… Tim Loh, 4 April, 2009 - 12:02pm login or register to post comments

 
But...
Corydalus would have fairly conspicuous ventral gill tufts at the base of each lateral filament. Generally, they also tend to have a flattish appearance and the lateral filaments have a slightly hairy look. (There are a few other larvae in the Dosonflies/Fishflies section that appear to be misidentified as well.)
… Lloyd Gonzales, 4 April, 2009 - 12:09pm login or register to post comments

 
hmmm...
I see what you mean when I looked at some Corydalus pics in the guide...the antennal segment however doesn't seem to add up..or it could be just a piece of debris floating in the water that resembles a 5th segment in the head shot :-/
… Tim Loh, 4 April, 2009 - 12:19pm login or register to post comments

 
Possibly...
but my view is not enlarged enough to see that detail. However, cf. Nigronia images here with Corydalus images here to see the fairly distinctive differences.
… Lloyd Gonzales, 4 April, 2009 - 12:24pm login or register to post comments

Moved
Moved from Fishflies.
… Tim Loh, 4 April, 2009 - 12:40am login or register to post comments

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