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 Cycadophyta Bessey (1907)
         Class †Cycadeoideopsida D.H.Scott (1923) [monotypic]
           Order †Cycadeoideales E.W.Berry (1916)
             Family †Cycadeoideaceae Buckland (1833)
               1 Genus †Bennetticarpus T.M.Harris (1932)
               2 Genus †Bennettistemon T.M.Harris (1932)
               3 Genus †Bucklandia Brongn. (1828), nom. cons. prop.
               4 Genus †Cycadeoidea Buckland ex Lindl. & Hutton (1832), nom. cons.
               5 Genus †Cycadeospermum Saporta (1874)
               6 Genus †Cycadolepis Saporta (1873)
               7 Genus †Monanthesia Wieland (1934)
               8 Genus †Sphenozamites (Brongn.) Miq. (1851)