Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Order Pseudoscorpiones De Geer, 1778
           Suborder Epiocheirata Harvey, 1992
             Superfamily Chthonioidea Daday, 1888
               1 Family Chthoniidae Daday, 1888
               2 Family †Dracochelidae Schawaller, Shear & Bonamo, 1991
               3 Family Lechytiidae Chamberlin, 1929 see Subfamily Lechytiinae Chamberlin, 1929
               4 Family Pseudotyrannochthoniidae Beier, 1932
               5 Family Tridenchthoniidae Balzan, 1892 see Subfamily Tridenchthoniinae Balzan, 1892