Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Order Scorpiones Koch, 1837 - scorpions
           Suborder Neoscorpionina Thorell & Lindström, 1885
             Infraorder Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911
               01 Family †Akravidae Levy, 2007
               02 Family †Archaeobuthidae Lourenço, 2001
               03 Family Bothriuridae Simon, 1880
               04 Family Buthidae Koch, 1837
               05 Family Chactidae Pocock, 1893
               06 Family Chaerilidae Pocock, 1893
               07 Family †Chaerilobuthidae Lourenço & Beigel, 2011
               08 Family Diplocentridae Karsch, 1880
               09 Family Euscorpiidae Laurie, 1896
               10 Family Hemiscorpiidae Pocock, 1893
               11 Family Heteroscorpionidae Kraepelin, 1905
               12 Family Hormuridae Laurie, 1896
               13 Family Iuridae Thorell, 1876
               14 Family †Palaeoeuscorpiidae Lourenço, 2003
               15 Family †Palaeopisthacanthidae Kjellesvig-Waering, 1986
               16 Family Pseudochactidae Gromov, 1998
               17 Family Scorpionidae Latreille, 1802
               18 Family Scorpiopidae Kraepelin, 1905
               19 Family Superstitioniidae Stahnke, 1940
               20 Family Troglotayosicidae Lourenço, 1998
               21 Family Typhlochactidae Mitchell, 1968
               22 Family Urodacidae Pocock, 1893
               23 Family Vaejovidae Thorell, 1876