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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Beetles (Coleoptera) » Ground and Water Beetles (Adephaga) » Ground Beetles (Carabidae) » Elaphrinae » Elaphrini » Marsh Ground Beetles (Elaphrus) » Elaphrus ruscarius
Photo#271368
Marsh Ground Beetle - Elaphrus ruscarius
Copyright © 2009 tom murray

Marsh Ground Beetle - Elaphrus ruscarius
Montezuma, Cayuga County, New York, USA
April 27, 2009
Size: 6.5mm
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Contributed by tom murray on 1 May, 2009 - 8:36pm
Last updated 13 June, 2009 - 12:40am

Moved
Moved from Marsh Ground Beetles.
… tom murray, 13 June, 2009 - 12:40am login or register to post comments

Elaphrus
Tom, there were two specimens of E. ruscarius and one E. californicus in same packet labeled #271368, #271367. Consequently, I cannot reliably determine the correspondence of photo-to-species in such combined cases where the two species are almost identical dorsally. They are distinguished by ventral punctures coarse in E. ruscarius vs fine in E. californicus.
… Peter Messer, 11 June, 2009 - 8:03pm login or register to post comments

 
Peter
I uploaded large pictures for all 3 beetles. I think the other 2 (271367 and 287168)look to have the same greenish color, while this one looks darker. So with the third beetle picture posted, and larger pictures do you think this could be called E. californicus, and the other 2 E. ruscarius?
… tom murray, 11 June, 2009 - 10:14pm login or register to post comments

 
Elaphrus ruscarius
based on matching the individual arrangements of elytral spots of each specimen in the batch which of course has nothing to do with actual taxonomic distinctions. Dorsal phototography and color generally cannot be used reliably to distinguish E. ruscarius from E. californicus.
… Peter Messer, 12 June, 2009 - 6:42pm login or register to post comments

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