Class Scorpionida Latreille, 1810 - scorpions
   Order Scorpiones Koch, 1837 - scorpions
     Suborder Neoscorpionina Thorell & Lindström, 1885
       Infraorder Orthosterni Pocock, 1911
         1 ?Genus †Palaeopisthacanthus Petrunkevitch, 1913
         2 ?Genus †Compsoscorpius Petrunkevitch, 1949
         3 Superfamily Buthoidea Koch, 1837
         4 Superfamily Chactoidea Pocock, 1893
         5 Superfamily Scorpionoidea Latreille, 1802
         6 Superfamily Vaejovoidea Thorell, 1876