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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Predaceous Diving Beetles (Dytiscidae) » Hydroporinae » Hygrotini » Hygrotus » Hygrotus infuscatus
Photo#74754
small water beetle - Hygrotus infuscatus
Copyright © 2006 Jim McClarin

small water beetle - Hygrotus infuscatus
Organ Mountains foothills, Dona Ana County, New Mexico, USA
August 6, 2006
Size: about 4.8 mm
It seemed strange to observe so many water beetles so far from a river ,lake, or pond. When I mentioned this to a staffer at the Dripping Springs Nature Area they said the beetles might have come from a livestock watering trough in the area. I think this is the only dytiscid that came to my UV lights during my New Mexico trip. Hydro*philids were quite common however.

(Incorrectly IDed to genus from specimens in New Mexico State University arthropod collection where this specimen now resides.)

Images of this individual: tag all
small water beetle - Hygrotus infuscatus small water beetle - Hygrotus infuscatus
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Contributed by Jim McClarin on 2 September, 2006 - 10:04pm
Last updated 4 May, 2016 - 5:38pm

Moved
Moved from Predacious Diving Beetles.
… Jim McClarin, 20 January, 2009 - 8:55am login or register to post comments

Hygrotus fuscatus
I see (though barely) a vertical carina/keel at the humeral angle of the epipleuron (brings it to genus);
According to Larson, H. fuscatus has surface punctures that do not form ridges and appear relatively even with no coarse punctation; the similar species H. unguicularis has fine surface punctation with scattered sparse large punctures; there is a dark medial spot on the pronotum and 4-5 longitudinal dark stripes/blotches on each elytron; the 2 species can be further separated by the shape and size of the male anterior protarsal claws, which are not visible in these images. H. unguicularis has also not been reported from New Mexico.

Also I have a number of identified specimens in my collection from Alberta that fit the features present in your images.
… Tim Loh, 20 January, 2009 - 1:30am login or register to post comments

 
Great work!
Thanks, Tim.
… Jim McClarin, 20 January, 2009 - 8:54am login or register to post comments

 
Spelling mistake :(
it's actually H. infuscatus...didn't know why I missed the first 2 letters :-[
… Tim Loh, 7 March, 2009 - 6:53pm login or register to post comments

 
Somehow
it got where it belonged though :-)
… Jim McClarin, 8 March, 2009 - 3:51am login or register to post comments

Moved
Moved from Coptotomus.
… Jim McClarin, 20 January, 2009 - 12:58am login or register to post comments

oops...
not Coptotomus..size a wee bit too small and I don't see a scutellum (all Colymbetines have at least a visible scutellum)..you might want to move this back to the family pages...meanwhile will try key this out for the time being..most likely something from Hydroporinae...
… Tim Loh, 20 January, 2009 - 12:14am login or register to post comments

 
Thanks
for setting me straight, Tim.
… Jim McClarin, 20 January, 2009 - 12:58am login or register to post comments

Moved
Moved from Predacious Diving Beetles.
… Jim McClarin, 2 September, 2006 - 10:07pm login or register to post comments

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