Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911
       Superfamily Buthoidea Koch, 1837
         1 Family †Archaeobuthidae Lourenço, 2001 [monotypic]
         2 Family †Palaeoburmesebuthidae Lourenço, 2015
         3 Family †Chaerilobuthidae Lourenço & Beigel, 2011 [monotypic]
         4 Family †Palaeotrilineatidae Lourenço, 2012 [monotypic]
         5 Family †Sucinlourencoidae Rossi, 2015 [monotypic]
         6 Family †Protobuthidae Lourenço & Gall, 2004 [monotypic]
         7 Family Buthidae Koch, 1837
         8 Family Bothriuridae Simon, 1880