Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Order Scorpiones Koch, 1837 - scorpions
           Suborder †Branchioscorpionina Kjellesvig-Waering, 1986
             Infraorder †Holosternina Kjellesvig-Waering, 1986 see Suborder Holosternina Kjellesvig-Waering, 1986
               01 Superfamily †Acanthoscorpionoidea Kjellesvig-Waering, 1986
               02 Superfamily †Allopalaeophonoidea Kjellesvig-Waering, 1986 [monotypic]
               03 Superfamily †Archaeoctonoidea Petrunkevitch, 1949 [monotypic]
               04 Superfamily †Eoctonoidea Kjellesvig-Waering, 1986
               05 Superfamily †Gigantoscorpionoidea Kjellesvig-Waering, 1986 [monotypic]
               06 Superfamily †Mesophonoidea Wills, 1910
               07 Superfamily †Palaeoscorpioidea Lehmann, 1944
               08 Superfamily †Proscorpioidea Scudder, 1885
               09 Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986
               10 Superfamily †Stoermeroscorpionoidea Kjellesvig-Waering, 1986 [monotypic]