[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Pseudoscorpiones De Geer, 1778
         [Suborder] Heterosyphronida Dunlop, Penney & Jekel, 2020, orth. inval. see Suborder Heterosphyronida Chamberlin, 1929
           Superfamily Chthonoidea Dunlop, Penney & Jekel, 2010, orth. inval. see Superfamily Chthonioidea Daday, 1889
             Family Chthoniidae Daday, 1889
               Genus †Prionochthonius Wriedt, Harvey, Hammel, Kotthoff & Harms, 2021