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 †Moresnetiophyta Doweld (2001) see Division Pteridospermatophyta Meyen
             Class †Moresnetiopsida Doweld (2001)
               Order †Pullarithecales Doweld (1998)
                 1 Family †Pullarithecaceae Doweld (1998)
                 2 Family †Calathiopsidaceae Doweld (2001) [monotypic]
                 3 Family †Austrocalycaceae Doweld (2001), orth. inval. see Family Austrocalyxaceae J.C. Vega & S.Archang. (2001)
                 4 Family †Gnetopsidaceae Doweld (2001) [monotypic]