Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †Stylonurina Diener, 1924
       Superfamily †Mycteropoidea Cope, 1886
         1 Family †Drepanopteridae Kjellesvig-Waering, 1966 [monotypic]
         2 Family †Hibbertopteridae Kjellesvig-Waering, 1959
         3 Family †Mycteropidae Cope, 1886