Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †Eurypterina Burmeister, 1843
       †Diploperculata Lamsdell, Hoşgör & Selden, 2013
         Superfamily †Carcinosomatoidea Størmer, 1934
           Family †Mixopteridae Caster & Kjellesvig-Waering, 1955
             1 Genus †Lanarkopterus Ritchie, 1968
             2 Genus †Mixopterus Ruedemann, 1920