Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †Eurypterina Burmeister, 1843
       †Diploperculata Lamsdell, Hoşgör & Selden, 2013
         Superfamily †"Waeringopteroidea" nom. ined.
           1 Genus †Grossopterus Størmer, 1935
           2 Genus †Orcanopterus Stott, Tetlie, Braddy, Nowlan, Glasser & Devereux, 2005
           3 Genus †Waeringopterus Leutze, 1961