Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911
       Superfamily Buthoidea Koch, 1837
         Family Buthidae Koch, 1837
           01 Genus Centruroides Marx, 1890
           02 Genus Microcharmus Lourenço, 1995
           03 Genus Microtityus Kjellesvig-Waering, 1966
           04 Genus †Palaeoakentrobuthus Lourenço & Weitschat, 2000
           05 Genus †Palaeoananteris Lourenço & Weitschat, 2001
           06 Genus †Palaeoisometrus Lourenço & Weitschat, 2005
           07 Genus †Palaeogrosphus Lourenço, 2000
           08 Genus †Palaeolychas Lourenço & Weitschat, 1996
           09 Genus †Palaeoprotobuthus Lourenço & Weitschat, 2000
           10 Genus †Palaeospinobuthus Lourenço, Henderickx & Weitschat, 2005
           11 Genus †Palaeotityobuthus Lourenço & Weitschat, 2000
           12 Genus Tityus Koch, 1836
           13 Genus †Uintascorpio Perry, 1995