Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [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 Pteridophytanaeᵀ Doweld (2001)
                     [Phylum Pteridophytaᵀ 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)
                             [Suborder †Hydropteridineaeᵀ Doweld (2001)]