Chelicerata Heymons, 1901
   †Eurypterida Burmeister, 1843 - eurypterids
     †Stylonurina Diener, 1924
       Superfamily †Rhenopteroidea Størmer, 1951 [monotypic]
         Family †Rhenopteridae Størmer, 1951
           Genus †Leiopterella Lamsdell, Braddy, Loeffler & Dineley, 2010