[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?]
             1 Genus †Pentlandopterus Lamsdell, Hoşgör & Selden, 2013
             2 Genus †Paraeurypterus Lamsdell, Hoşgör & Selden, 2013
             3 Family †Dolichopteridae Kjellesvig-Waering & Størmer, 1952
             4 Family †Eurypteridae Burmeister, 1843 [monotypic]
             5 Family †Erieopteridae Tollerton, 1989 [monotypic]
             6 Family †Strobilopteridae Lamsdell & Selden, 2013