[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         Suborder Neoscorpionina Thorell & Lindström, 1885
           Infraorder Orthosterni Pocock, 1911
             Parvorder Iurida Soleglad & Fet, 2003
               Superfamily Chactoidea Pocock, 1893
                 01 Family †Protochactidae Lourenço, Magnani & Stockar, 2022 [monotypic]
                 02 Family Chactidae Pocock, 1893
                 03 Family †Palaeoeuscorpiidae Lourenço, 2003
                 04 Family Euscorpiidae Laurie, 1896
                 05 Family Scorpiopidae Kraepelin, 1905
                 06 Family Superstitioniidae Stahnke, 1940
                 07 Family Troglotayosicidae Lourenço, 1998
                 08 Family Belisariidae Lourenço, 1998
                 09 Family Typhlochactidae Mitchell, 1968
                 10 Family ‡Akravidae Levy, 2007