Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †Eurypterina Burmeister, 1843
       †Diploperculata Lamsdell, Hoşgör & Selden, 2013
         Superfamily †Carcinosomatoidea Størmer, 1934
           Family †Carcinosomatidae Størmer, 1934
             1 Genus †Carcinosoma Claypole, 1890
             2 Genus †Eocarcinosoma Caster & Kjellesvig-Waering, 1964
             3 Genus †Eusarcana Strand, 1942
             4 Genus †Rhinocarcinosoma Novojilov, 1962