[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         [Suborder] †Holosternina Kjellesvig-Waering, 1986
           1 Superfamily †Acanthoscorpionoidea Kjellesvig-Waering, 1986
           2 Superfamily †Allopalaeophonoidea Kjellesvig-Waering, 1986 [monotypic]
           3 Superfamily †Eoctonoidea Kjellesvig-Waering, 1986
           4 Superfamily †Gigantoscorpionoidea Kjellesvig-Waering, 1986 [monotypic]
           5 Superfamily †Mesophonoidea Wills, 1910
           6 Superfamily †Palaeoscorpoidea Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Superfamily Palaeoscorpioidea Lehmann, 1944
           7 Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986