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
               Superfamily †Mesophonoidea Wills, 1910
                 1 Family †Centromachidae Petrunkevitch, 1953
                 2 Family †Heloscorpionidae Kjellesvig-Waering, 1986
                 3 Family †Liassoscorpionidae Kjellesvig-Waering, 1986, orth. inval.
                 4 Family †Mazoniidae Petrunkevitch, 1913
                 5 Family †Mesophonidae Wills, 1910
                 6 Family †Willsiscorpionidae Kjellesvig-Waering, 1986