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 †Moresnetiophyta Doweld (2001) see Division Pteridospermatophyta Meyen Class †Moresnetiopsida Doweld (2001) Order †Pullarithecales Doweld (1998) Family †Calathiopsidaceae Doweld (2001) [monotypic] 1 Genus †Calathiops Göpp. (1865)