Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   Pseudoscorpiones De Geer, 1778
  Count: [g†g] 26f;22g; †1f;13g [8 Jan 2021]
     Heterosyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Suborder Heterosphyronida Chamberlin, 1929
    Count: [g†g] 3f;5g; †2g [8 Jan 2021]
       Superfamily Chthonoidea Dunlop, Penney & Jekel, 2010, orth. inval. see Superfamily Chthonioidea Daday, 1888
      Count: [g†g] 3f;5g; †2g [8 Jan 2021]
         Family Chthoniidae Daday, 1888
        Count: [g†g] 5g; †2g [8 Jan 2021]
           Genus Paraliochthonius Beier, 1956
          Count: -