NOMEN: Pseudoscorpii Siebold 1848: 507 [C.Th. von Siebold. Lehrbuch der vergleichenden Anatomie der wirbellosen Thire. In: Siebold & Stannius1846-1848. Lehrbuch der vergleiochenden Anatomie. Erste Theil. Wirbellose Thiere. Berlin. Verlag von Veit & Comp. 1848. 1-679]
ORIGINAL LISTED MEMBERSHIP (Siebold
1848): Obisium, Chelifer
JUNIOR
CIRCUMSCRIPTIONAL SYNONYMS:
= Pseudoscorpioda Haeckel
1866
= Pseudoscorpionina Lankester
1881
= Pseudoscorpionea Gegenbaur
1878
= Diplochelonethi
Thorell 1882
= Pseudoscorpionida
Lankester 1888
= Pseudoscorpionidea Lang 1888
= Chelonethida
Cambridge 1892
= Pseudoscorpionides Beier 1932
= Chelata Petrunkevitch 1946
= Pseudoscorpionoidea
Beklemishev 1952
= Pseudoscorpionodea Dubinin
1962 (in Rohdendorf
1962)
TYPIFIED NAME IN BASIC FORMAT: Chelifer/fg
TYPIFIED NAMES IN USE: Cheliferes, Cheliferoidae
MODERN
STATUS: 
the valid, the
oldest name of a generally accepted, holophyletic taxon.
COMMENT. Often the name Pseudoscorpii is confused with the name Pseudoscorpiones Latreille 1825, which actually belongs to a taxon uniting Pseudoscorpii and Mycetophora, being the senior synonym of Haplocnemata Börner 1904. The error comes from the fact, that the both names are Latin translations of the initial French name Faux-Scorpions, which was used by De Geer (1778) for Pseudoscorpii (at that time all Pseudoscorpii constituted a single genus Chelifer, and did not need a Latin circumscriptional name).
Often for Pseudoscorpii a wrong name Chelonethi is used. Actually, a circumscriptional synonym of Pseudoscorpii is Diplochelonethi Thorell 1882, while the name Chelonethi Thorell 1882 was given for a taxon which united Pseudoscorpii (= Diplochelonethi) with Haplochelonethi Thorell 1882 (nomen nudum).