Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     †Holosternina Kjellesvig-Waering, 1986
       Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986
         Family †Spongiophonidae Kjellesvig-Waering, 1986 [monotypic]
           1 Genus †Spongiophonus Wills, 1947