[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         [Suborder] †Holosternina Kjellesvig-Waering, 1986
           Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986
             1 Family †Praercturidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Praearcturidae Kjellesvig-Waering, 1986
             2 Family †Spongiophonidae Kjellesvig-Waering, 1986 [monotypic]