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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Derodontoidea » Tooth-necked Fungus Beetles (Derodontidae) » Laricobius » Laricobius nigrinus
Photo#91466
Tiny Black Beetle - Laricobius nigrinus
Copyright © 2006 Cheryl Moorehead

Tiny Black Beetle - Laricobius nigrinus
Seattle, King County, Washington, USA
December 30, 2006
Size: approx 3mm
I put this here because I don't have any idea what kind of beetle this is. It seemed to have "pitted" elytra, but with my eyes, I couldn't see much else. It was sunning itself on the exposed roots of my Western Hemlock. I'm inclined to think it's a Carabid, but it was very sluggish...
It's not very warm here, right now, though. Sorry for the resolution, I forgot to put my camera on RAW format.

Images of this individual: tag all
Tiny Black Beetle - Laricobius nigrinus Tiny Black Beetle - Laricobius nigrinus Tiny Black Beetle - Laricobius nigrinus Tiny Black Beetle - Laricobius nigrinus
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Contributed by Cheryl Moorehead on 30 December, 2006 - 5:19pm
Last updated 31 December, 2006 - 5:22am

Just correcting the spelling,
Just correcting the spelling, it's Laricobius "nigrinus".
… Crystal Maier, 21 May, 2007 - 5:18pm login or register to post comments

 
Fixed
Thanks, Crystal.
… Jim McClarin, 21 May, 2007 - 5:53pm login or register to post comments

Moved
Moved from Beetles.
… Jim McClarin, 31 December, 2006 - 5:22am login or register to post comments

Not inclined
Notice the slightly clubbed antennae. No car*abid has them. The neat rows of fairly long setae are distinctive, but of what I'm unsure. For a wild guess I'm going to say this is Lari*cobius nigr*inus (family Dero*dontidae) and it has been snacking on Wo*oly Adel*gids that are afflicting your Western Hemlock.
… Jim McClarin, 30 December, 2006 - 8:04pm login or register to post comments

 
I'll move it
For the time being, I'll move it to the Order page. I'll see if I can find it again tomorrow, if it's sunny.
… Cheryl Moorehead, 30 December, 2006 - 9:06pm login or register to post comments

 
Hi Cheryl,
It would be nice to get some more detailed photos of this species but it looks like my wild guess is correct. This is the derodontid Laricobius nigrinis. I found some images and plenty to read on other sites:
http://www.gainvasives.org/hwa/biocontrol.html
http://www.insectimages.org/search/action.cfm?q=Laricobius
http://www.dcnr.state.pa.us/forestry/woollyadelgid/pestmanagement.aspx
http://www.mountaintimes.com/mtweekly/2005/0120/goodbugs.php3

This is a native species in your area but it has been reared in laboratories and released widely as a biological control agent for Wool*y Ad*elgid, which infests hemlocks.

I'll move your images because this is a new bugguide species but maybe you can get some better ones and frass these later.
… Jim McClarin, 31 December, 2006 - 5:16am login or register to post comments

 
Thank you so much!
I'll keep my eyes peeled.
… Cheryl Moorehead, 31 December, 2006 - 9:24am login or register to post comments

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