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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Series Staphyliniformia » Hydrophiloidea » Clown Beetles (Histeridae) » Abraeinae » Acritini » Acritus
Photo#183777
1.1mm black histerid - Acritus
Copyright © 2008 Jim McClarin

1.1mm black histerid - Acritus
Hudson, Hillsborough County, New Hampshire, USA
May 18, 2008
Size: about 1.1 mm
I spent a half-hour or so lifting bark on some large maple logs, finding assorted Histeridae and other families, including this tiny, glistening, black speck of a beetle that I hoped was a histerid. It was! Here it's seen next to millimeter markings.

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1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus 1.1mm black histerid - Acritus
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Contributed by Jim McClarin on 19 May, 2008 - 10:21pm
Last updated 12 November, 2011 - 3:19pm

Posted new pix
showing a bit more detail here and there.
… Jim McClarin, 23 May, 2008 - 10:08pm login or register to post comments

Moved
Moved from Clown Beetles.
… Jim McClarin, 20 May, 2008 - 8:28pm login or register to post comments

nice!
I love these little guys. I always need really high mag to ID. Presumably Acritus (rather than Aeletes or Bacanius) since it looks like a visible scutellum and pygidium in some of the Pics?
… Rick Buss, 20 May, 2008 - 10:00am login or register to post comments

 
Thanks, Rick.
I don't see a scutellum but there are several exposed abdominal segments that the other two genera don't seem to have. I checked the New Hampshire checklist to see how many species of Acritus there were to consider. The answer appears to be zero although I suspect it's a matter of slow updating. Tom Murray and I have generated a number of new state records. I may decant Sunday's vial and see if I can make out a scutellum with my 25x macroscope.
… Jim McClarin, 20 May, 2008 - 5:42pm login or register to post comments

 
NH NY
D&A say Acritus strigosus and A exiguus are in NY. From here in the vast southwest, NH and NY seem like the same thing! My A strigosus are smaller but I can't compare details of punctation from the photo.
The scutellum of Acritus is usually visible at 120X but can be pretty small. I was probably seeing an illusion in the photos. Maybe Aeletes politus which is almost impunctate ... Jeff Gruber may know at a glance?
… Rick Buss, 20 May, 2008 - 6:08pm login or register to post comments

 
Punctation...
visible in the second photo rules out A*eletes p*olitus. This is almost certainly an Acritus. Would need to scope the specimen, to know for sure. May be able to put a species name on it with it in hand. Bousquet and Laplante recently (2006) described a new species of Acritus, which is another possibility.
… Jeff Gruber, 20 May, 2008 - 8:12pm login or register to post comments

 
Specimen is available.
Would you like me to send it to you?
… Jim McClarin, 20 May, 2008 - 8:26pm login or register to post comments

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