Chelicerata Heymons, 1901
   Pseudoscorpiones De Geer, 1778
     Homosyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Group Homosphyronida Chamberlin, 1929
       Iochierata Dunlop, Penney & Jekel, 2010, orth. inval. see Suborder Iocheirata Harvey, 1992
         Panctenata Balzan, 1892
           Superfamily Cheliferoidea Risso, 1826
             Family Withiidae Chamberlin, 1931
               1 Genus †Beierowithius Mahnert, 1979
               2 Genus Withius Kew, 1911