Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Pteridophytanae Doweld (2001)
           Phylum Pteridophyta Schimp. (1879) see Phylum Filicinophyta
             Class Marsileopsida Trevis. (1877) see Order Salviniales Link (1833)
               Subclass Salviniidae Reveal (1996) see Order Salviniales Link (1833)
                 Order †Hydropteridiales Doweld (2001) [monotypic] see Order Salviniales Link (1833)
                   Family †Hydropteridiaceae Doweld (2001) [monotypic]
                     1 Genus †Hydropteridium Doweld (2001)