Illinois Natural History Survey - University of Illinois

Steve TaylorCVPeopleCave BiologyPseudoscorpionsGerromorphaNepomorphaAradidaeCoreidaeReduviidaeStrepsiptera |


Apochthonius diabolus Muchmore 1967 (Arkansas) 
Photo by Steve Taylor and Mike Slay


Therea are about 420 species of pseudoscorpions described from the United States. Here is a checklist (current through August 2009) of the Order Pseudoscorpiones (Arachnida) for the United States of America, parsed from Mark Harvey's definitive and most excellent world catalog.

Checklist of Pseudoscorpions of the United States


I've summarized the above list in this bubble chart (Click on image to interact - you may need to download a Java Plugin.):



Looking just at the family Chernetidae in the United States, it is easy to see where most of the research has been done:




A pseudoscorpion from a lava tube cave in northern California
Photo by Jean Krejca and Steve Taylor


A pseudoscorpion, probably in the subfamily Microcreagrinae, from a cave in northwestern Arkansas. Scale bar in lower right is 3 mm.
Photographed by Mike Slay, with whom I'm working on Ozark pseudoscorpions - we'll soon have a name for this critter!




An adult male pseudoscorpion, Chthonius (Ephippiochthonius) cf. tetrachelatus (Preyssler 1790) (Chthoniidae), from forest leaflitter in western Illinois (Monroe County).
Horizontal line in upper right is 1 mm in length. Image is a mosaic of photographs of a specimen mounted on a glass slide. Photo by Steve Taylor.




A pseudoscorpion from leaflitter collected in the hills adjacent to the Illinois River in Jersey County near Grafton, Illinois.
Photo by Steve Taylor.




Another pseudoscorpion, probably Microbisium parvulum Banks (1895) (Neobisiidae), from upland forest leaflitter at base of a tree in Monroe County, Illinois. Microbisium parvulum is perhaps the most commonly collected, and most abundant, species of pseudoscorpion in Illinois.
Vertical line in lower right is 1 mm in length. Image is of a specimen mounted on a glass slide. Photo by Steve Taylor.



Two pseudoscorpions. Photo (c) 2010 Ashley Bradford.

An on-line key to Canadian psuedoscorpions based on photomicrographs is available here


This page is maintained by Steve Taylor. Please email with comments and corrections.

Created 13 September 2009, last modified 9 May 2011.

Illinois Natural History Survey

1816 South Oak Street, MC 652
Champaign, IL 61820

Terms of use. Email the Web Administrator with questions or comments.

© 2021 University of Illinois Board of Trustees. All rights reserved.
For permissions information, contact the Illinois Natural History Survey.

Staff Intranet