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 Pteridophytanae Doweld (2001) Phylum †Sphenophyllophyta D.H.Scott (1900) [monotypic] see Division Monilophyta Cantino & Donoghue Class †Sphenophyllopsida Engl. (1892) Order †Cheirostrobales Zimmerm. (1930) [monotypic] see Order Sphenophyllales Wettst. (1903) Family †Cheirostrobaceae D.H.Scott (1902) see Family Sphenophyllaceae Warm. (1891)