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
                 Family †Willsiscorpionidae Kjellesvig-Waering, 1986