Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001)
       Division †Pteridospermatophyta Meyen
         Class †Lyginopteridopsida Novák (1961)
           Order †Callistophytales Rothwell (1981)
             1 Family †Callistophytaceae Stidd & J.W.Hall (1970), nom. cons. prop.
             2 Family †Cornucarpaceae Doweld (2001)