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 †Pachytestopsida Doweld (2001) Order †Pachytestales Doweld (2001) 1 Family †Polylophospermaceae Doweld (2001) [monotypic] 2 Family †Pachytestaceae Doweld (2001), nom. cons. prop. 3 Family †Stephanospermaceae Doweld (2001) [monotypic]