[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
             1 Genus †Compsoscorpius Petrunkevitch, 1949, incertae sedis
             2 Genus †Corniops Jeram, 1994, incertae sedis
             3 Genus †Suraju Martine, Ricardi-Branco, Beloto & Jurigan, 2020, incertae sedis
             4 Family †Palaeopisthacanthidae Kjellesvig-Waering, 1986
             5 Parvorder Buthida Soleglad & Fet, 2003
             6 Parvorder Iurida Soleglad & Fet, 2003