[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Eurypterida Burmeister, 1843 - eurypterids
         [Suborder] †Eurypterina Burmeister, 1843
           Superfamily †Onychopterelloidea Lamsdell, 2011 [monotypic]
             Family †Onychopterellidae Lamsdell, 2011
               1 Genus †Alkenopterus Størmer, 1974
               2 Genus †Onychopterella Størmer, 1951
               3 Genus †Tylopterella Størmer, 1951