[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         Suborder Neoscorpionina Thorell & Lindström, 1885
           Infraorder Orthosterni Pocock, 1911
             Parvorder Iurida Soleglad & Fet, 2003
               Superfamily Chactoidea Pocock, 1893
                 Family †Protochactidae Lourenço, Magnani & Stockar, 2022 [monotypic]
                   1 Genus †Protochactas Lourenço, Magnani & Stockar, 2022