Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †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