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 †Phasmatocycadopsida Doweld (2001) a Order †Gigantopteridales X.X.Li & Z.Q. Yao (1983) b Order †Phasmatocycadales Doweld (2001) [monotypic]