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 Cycadophytanae Doweld (2001)
           Phylum †Peltaspermophyta Doweld (2001) see Division Pteridospermatophyta Meyen
             Class †Dictyopteridiopsida Doweld (2001)
               Order †Rigbyales Doweld (2001) [monotypic]
                 Family †Rigbyaceae J.M.Anderson & H.M.Anderson (1985), nom. cons. prop.
                   1 Genus †Rigbya Lacey, Dijk & Gordon-Gray (1975)