[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Eurypterida Burmeister, 1843 - eurypterids
         [Suborder] †Eurypterina Burmeister, 1843
           Superfamily †'Eurypteroidea' Burmeister, 1843 [monophyletic?]
             Family †Dolichopteridae Kjellesvig-Waering & Størmer, 1952
               1 Genus †Clarkeipterus Kjellesvig-Waering, 1966
               2 Genus †Dolichopterus Hall, 1859
               3 Genus †Ruedemannipterus Kjellesvig-Waering, 1966