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 †Cladoxylophyta Doweld (2001) [monotypic] see Division Monilophyta Cantino & Donoghue Class †Cladoxylopsida Novák (1930) - cladoxylopsids see Class Equisetopsida C.Agardh (1825) Order †Steloxylales Doweld (2001) [monotypic] see Order Cladoxylales W.Zimm. (1930) 1 Family †Steloxylaceae C.A.Arnold ex Doweld (2001) [monotypic] see Family Cladoxylaceae Unger (1856)