[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         [Suborder] †Holosternina Kjellesvig-Waering, 1986
           Superfamily †Mesophonoidea Wills, 1910
             1 Family †Centromachidae Petrunkevitch, 1953
             2 Family †Gallioscorpionidae Lourenço & Gall, 2004 [monotypic]
             3 Family †Heloscorpionidae Kjellesvig-Waering, 1986 [monotypic]
             4 Family †Mazoniidae Petrunkevitch, 1913 [monotypic]
             5 Family †Mesophonidae Wills, 1910 [monotypic]
             6 Family †Willsiscorpionidae Kjellesvig-Waering, 1986 [monotypic]