Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911
       Superfamily Buthoidea Koch, 1837
         Family †Archaeobuthidae Lourenço, 2001 [monotypic]
           1 Genus †Archaeobuthus Lourenço, 2001