Chelicerata Heymons, 1901
   Pseudoscorpiones De Geer, 1778
     Homosyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Group Homosphyronida Chamberlin, 1929
       Atoposyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Suborder Atoposphyronida Harvey, 2019
         1 Superfamily Feaelloidea Ellingsen, 1906