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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Beetles (Coleoptera) » Water, Rove, Scarab, Longhorn, Leaf and Snout Beetles (Polyphaga) » Water Scavenger and Clown Beetles (Hydrophiloidea) » Water Scavenger Beetles (Hydrophilidae) » Hydrochara
Photo#161339
Water Beetle 2227 - Hydrochara
Copyright © 2007 Steve Nanz

Water Beetle 2227 - Hydrochara
Monhegan Island, Maine, USA
August 23, 2007
Size: ~15mm
Came to t UV light. A pair of Water Scavenger Beetles perhaps? I thought they were Predacious Diving Beetles at first but then I noticed the antenna on the bigger one seemed wrong. Or are they different species in unrelated families? They sure don't look very similar despite their apparent activity.
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Contributed by Steve Nanz on 18 December, 2007 - 12:09am
Last updated 21 December, 2007 - 3:50am

Both
Dytiscid to the left, Hydrophilid to the right!
… Boris Büche, 18 December, 2007 - 8:02am login or register to post comments

 
size?
do you have size estimates for these beetles?

at first glance, I'd say the Hydrophilid looks like a species of Hydrochara (which would put it about 12-18mm). compare with . A ventral photo might get it to species.
… Tim R. Moyer, 18 December, 2007 - 11:37am login or register to post comments

 
Thank You Both
Counting the stitches in the sheet, I'm guessing the Hydrophilid to be about 16mm.
… Steve Nanz, 19 December, 2007 - 4:22am login or register to post comments

 
Dytiscid possibly Agabus
that would make the Dytiscid somewhere around 5-7mm. That size and the dark coloration (I see two faint spots between the eyes) make this a candidate for a species of Agabus. But that's just an amateur guess.
… Tim R. Moyer, 19 December, 2007 - 3:35pm login or register to post comments

 
Faint Spots
My mistake. I see the faint reddish spots. I thought you were talking about the grayish spots.
… Steve Nanz, 26 December, 2007 - 3:34am login or register to post comments

 
Closer to 9mm?
I think it may be closer to 9mm. (FYI - vertical stitches, 4.4/1mm, on the fabric are bigger than horizontal stitches, 2.8/1mm). I accidently uploaded the image at higher resolution. If you click the image it will enlarge. I see the faint spots but I'm not sure if it's just the angle of the lighting and junk. I think the Hydrophilid may actually be a little under 15mm. Both are hard to tell given the angle.
… Steve Nanz, 20 December, 2007 - 5:49am login or register to post comments

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