Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Previous events

sub-1mm beetle - Acrotrichis

sub-1mm beetle - Acrotrichis
Hollis, Hillsborough County, New Hampshire, USA
October 1, 2005
Size: 0.9 - 1.0 mm
This minute beetle was apparently on one of the woodland fungi I searched for beetles. My M.O. was to spead a piece of white plastic (an opened-out plastic grocery-type bag) and palpate, crumble and/or mush various fungi over it to scare out the inhabitants. Roves and other beetles would drop onto the plastic where they could be easily collected.

Images leave a lot to be desired, but one at least is the best I have ever taken of a beetle this small. The other contains a small gray springtail for size comparison.

Images of this individual: tag all
sub-1mm beetle - Acrotrichis sub-1mm beetle - Acrotrichis

Acrotrichis sp.

This is a representative of the "featherwinged" beetles, or Ptiliidae (I believe the first one for the 'guide?). There are many, many genera, but this is a dead ringer for the genus Acrotrichus. The genus is widespread and speciose, so if you want a species determination you'd better start making your microscope slide preparations now!

Thanks for tackling a lot of the little critters- there are plenty more things out there not found in the Guide so long as you're ready to go for the small, obscure critters!


Thanks Zack!
Yes, it appears to be a first for the family on this site. I think I've contributed several new families so far, which gives me a sense of making a contribution here. Some day maybe I'll get a *real* lens for the tiny subjects. Meantime I'm still finding ways to get better images using my salvaged photocopier lens.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.