[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Eurypterida Burmeister, 1843 - eurypterids
         [Suborder] †Eurypterina Burmeister, 1843
           [Infraorder] †Diploperculata Lamsdell, Hoşgör & Selden, 2013
             Superfamily †Adelophthalmoidea Tollerton, 1989 [monotypic]
               Family †Adelophthalmidae Tollerton, 1989
                 1 Genus †Adelophthalmus Jordan, 1854
                 2 Genus †Bassipterus Kjellesvig-Waering & Leutze, 1966
                 3 Genus †Eysyslopterus Tetlie & Poschmann, 2008
                 4 Genus †Nanahughmilleria Kjellesvig-Waering, 1961
                 5 Genus †Parahughmilleria Kjellesvig-Waering, 1961
                 6 Genus †Pittsfordipterus Kjellesvig-Waering & Leutze, 1966
                 7 Genus †Pruemopterus Poschmann, 2021