[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Eurypterida Burmeister, 1843 - eurypterids
         [Suborder] †Stylonurina Diener, 1924
           1 Superfamily †Rhenopteroidea Størmer, 1951 [monotypic]
           2 Superfamily †Stylonuroidea Kjellesvig-Waering, 1959
           3 Superfamily †Kokomopteroidea Kjellesvig-Waering, 1966
           4 Superfamily †Mycteropoidea Cope, 1886
           5 Genus †Stylonuroides Kjellesvig-Waering, 1966, incertae sedis