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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Predaceous Diving Beetles (Dytiscidae) » Dytiscinae » Aciliini » Acilius » Acilius semisulcatus
Photo#487705
Acilius sp. - Acilius semisulcatus - female
Copyright © 2011 Ben Coulter

Acilius sp. - Acilius semisulcatus - Female
Millcreek Twsp., Erie County, Pennsylvania, USA
July 3, 2004
Size: possibly 15 mm
This was in a drainage ditch coming from a retention basin. Can this be identified to species? I have additional pics if needed.

Images of this individual: tag all
Acilius sp. - Acilius semisulcatus - female Acilius sp. - Acilius semisulcatus - female Acilius sp. - Acilius semisulcatus - female
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Contributed by Ben Coulter on 30 January, 2011 - 1:03am
Last updated 3 February, 2011 - 11:40pm

A. semisulcatus is correct...
Moved from Acilius.
… Tim Loh, 3 February, 2011 - 11:40pm login or register to post comments

 
Thanks
I appreciate your help with this beetle.
… Ben Coulter, 3 February, 2011 - 11:42pm login or register to post comments

Female
I can think of 2 or 3 candidates based on location; Provision of body size and a shot of the ventral surface may help land a more specific ID.
… Tim Loh, 30 January, 2011 - 11:59pm login or register to post comments

 
ventral shots added
Hi Tim. I added mediocre ventral shots taken from a movie I took of the beetle. It seems to have a black ventral surface, with yellow laterally on the abdomen, and yellow on the metafemur.

So, combined with the elytral sulci and the locality, this should be A. semisulcatus, right? Aquatic Beetles (Insecta: Coleoptera) of Northeastern Ohio by Eric Chapman records this species as the most widespread member of the genus locally.
… Ben Coulter, 2 February, 2011 - 4:36pm login or register to post comments

 
Ventral
Unfortunately, I took no ventral shots. I could give a crude estimate of size, but it was a long time ago. I'd say 15 mm wouldn't be too outlandish.

I'll try and remember to take ventrals of any dytiscids I find in the future.
… Ben Coulter, 31 January, 2011 - 12:28am login or register to post comments

Moved
Moved from Predaceous Diving Beetles.
… Ben Coulter, 30 January, 2011 - 1:20am login or register to post comments

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