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