Domain Eucaryota Subdomain Chlorota Doweld (2001) Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Lycopodiobiotina Doweld (2001) Phylum Isoëtophyta Doweld (2001) Subphylum Isoëtophytina Doweld (2001) Class Isoëtopsida Rolle (1884) Order †Takhtajanodoxales Snigirevskaya (1980) see Order Isoëtales Prantl (1874) Family †Takhtajanodoxaceae Snigirevsk. (1980) see Family Chaloneriaceae Pigg & G.W.Rothwell (1983)