Order Scorpiones Koch, 1837 - scorpions
   Suborder Neoscorpionina Thorell & Lindström, 1885
     Infraorder Orthosterni Pocock, 1911
       Parvorder Iurida Soleglad & Fet, 2003
         1 Superfamily Iuroidea Thorell, 1876 [monotypic]
         2.1 Superfamily Bothriuroidea Simon, 1880 [monotypic]
         2.2.1 Superfamily Superstitionoidea Stahnke, 1940, orth. inval. [monotypic] see Superfamily Superstitionioidea Stahnke, 1940
         2.2.2.1 Superfamily Chactoidea Pocock, 1893
         2.2.2.2.1.1 Family Caraboctonidae Kraepelin, 1905, incertae sedis
         2.2.2.2.1.2 Subfamily Uroctoninae Mello-Leitão, 1934, incertae sedis
         2.2.2.2.2.1 Family Troglotayosicidae Lourenço, 1998, incertae sedis
         2.2.2.2.2.2.1 Superfamily Scorpionoidea Latreille, 1802
         2.2.2.2.2.2.2 Superfamily Vaejovoidea Thorell, 1876
         3 Family Heteroscorpionidae Kraepelin, 1905, incertae sedis
         4 Family Typhlochactidae Mitchell, 1968, incertae sedis