Dytiscid - Acilius semisulcatus - BugGuide.Net

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Photo#265536

Copyright © 2009 tom murray

Dytiscid - Acilius semisulcatus

Groton, Middlesex County, Massachusetts, USA
April 12, 2009
Size: 12.4mm

This might be Acilius mediatus, but it just looks a little different to me.

Images of this individual: tag all

Dytiscid - Acilius semisulcatus

Dytiscid - Acilius semisulcatus

Dytiscid - Acilius semisulcatus

Dytiscid - Acilius semisulcatus

Contributed by tom murray on 12 April, 2009 - 7:24pm
Last updated 17 April, 2011 - 9:27pm

Moved

Moved from Acilius mediatus.
Don Chandler identified a specimen I gave him. The date on my label was off by a few days, but this has to be it, since I have no other photographs of an Acilius near this date.

… tom murray, 17 April, 2011 - 9:27pm

Moved

Moved from Predacious Diving Beetles.

… Tim Loh, 12 April, 2009 - 7:52pm

Yes, female A. mediatus

Another species that might be similar would be A. fraternus- in both species, females are non-sulcate (with no elytral ridges) and the hind legs are dark in colour (dark red to black). However A. fraternus is larger (min. size= 13 mm) and may not/rarely occur in your area (northern limits- NY)

… Tim Loh, 12 April, 2009 - 7:52pm

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