[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Eurypterida Burmeister, 1843 - eurypterids
         [Suborder] †Stylonurina Diener, 1924
           Superfamily †Kokomopteroidea Kjellesvig-Waering, 1966
             Family †Hardieopteridae Tollerton, 1989
               1 Genus †Hallipterus Kjellesvig-Waering, 1963
               2 Genus †Hardieopterus Waterston, 1979
               3 Genus †Tarsopterella Størmer, 1951