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Chthonius (Ephippiochthonius) sp. - Chthonius

Chthonius (Ephippiochthonius) sp. - Chthonius
ex Berlese sample of dead wood from near Charleston, Coles County, Illinois, USA
April 6, 2008
Size: Body length 1.3mm
The pseudoscorpion in this photo keys to C. (E.) tetrachelatus in Hoff 1949 (INHS Bulletin V. 24 Article 4), where it is covered as the only species of the subgenus for Illinois. I am not a pseudoscorpion specialist, but I am aware for example that, since 1949, one or more additional eastern-Nearctic species that originally were placed elsewhere have been reassigned into this subgenus (e.g., Muchmore 1981, Journal of Arachnology 9: 110-112), such that an automatic determination of tetrachelatus, as prescribed by Hoff 1949, no longer is a safe ID for this pseudoscorpion. Apparently, some of the species in question are externally similar and need to be examined structurally for accurate ID, and I would like to do that with this one. Is there a published key to the eastern-Nearctic species presently assigned to Ephippiochthonius? If so, thanks to anyone who can provide me with the citation for it.

Looks just like a miniature s
Looks just like a miniature solfugid. Read that pseudoscorpions are the closest relatives of solfugids.

Moved from Pseudoscorpions.

Well, I was going to create a place for this on the guide, but the classification is so convoluted, I'm forced to give up. The one classification scheme I found on the 'net does not even agree at the suborder level with the guide (sigh, ARG!).

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