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 Cycadophytanae Doweld (2001) Phylum †Peltaspermophyta Doweld (2001) see Division Pteridospermatophyta Meyen Class †Peltaspermopsida Doweld (2001) Order †Trichopityales Doweld (2001) Family †Psygmophyllaceae Zalessky (1937)