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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Ground and Water Beetles (Adephaga) » Predaceous Diving Beetles (Dytiscidae) » Dytiscinae » Aciliini » Graphoderus » Graphoderus liberus
Photo#932154
Graphoderus liberus
Copyright © 2014 metrioptera

Graphoderus liberus
Sanbornville, Carroll County, New Hampshire, USA
June 4, 2014
Size: 11 mm
Found dead in a parking lot.

Images of this individual: tag all
Graphoderus liberus Graphoderus liberus Graphoderus liberus Graphoderus liberus
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Contributed by metrioptera on 4 June, 2014 - 8:25pm
Last updated 15 November, 2019 - 8:29am

Moved
Moved from Dytiscinae.
… metrioptera, 15 November, 2019 - 8:29am login or register to post comments

Graphoderus
Definitely G. liberus
… Matthew Pintar, 15 November, 2019 - 8:15am login or register to post comments

Moved
Moved from Rhantus.
… Claude Tessier, 8 December, 2014 - 8:41pm login or register to post comments

I was able to get a closer look
at this photo today and it seems to lack the notch along the anterior margin of eyes, suggesting that this is a Graphoderus instead. And the only Graphoderus of that size in our area is Graphoderus liberus, which has a pronotum completely yellow to reddish brown, without black markings. I cannot see that very clearly in your photo. If you could add a picture showing the insect head on or little sideways, that would help tremendously. Example here
… Claude Tessier, 6 December, 2014 - 1:21pm login or register to post comments

 
added two photos
hope they're helpful!
… metrioptera, 7 December, 2014 - 6:02pm login or register to post comments

 
Good!
Now we can safely say that it is a member of the subfamily Dytiscinae because it lacks the notch on the inside margin of the eyes and that it cannot be a Rhantus.
By looking at the photos a little longer, I am more and more puzzled.
It could be a Graphoderus but I find the ventral color way too dark.
I'll play with it a little more and see if I can make up my mind.
Meanwhile, I'll move them to Dytiscinae.
… Claude Tessier, 8 December, 2014 - 8:39pm login or register to post comments

I measured the specimen...
It is 11 mm. Thanks for the ID!
… metrioptera, 4 December, 2014 - 4:19pm login or register to post comments

Looks like Graphoderus
but I cannot say for sure with that picture. If insect between 8 and 13 mm then Rhantus but if over 13 mm, Graphoderus!
… Claude Tessier, 3 December, 2014 - 9:12pm login or register to post comments

Moved
Moved from Beetles.
… v belov, 17 June, 2014 - 9:51pm login or register to post comments

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