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 †Lepidocarpopsida Doweld (2001) Order †Pleuromeyales Zimmerm. (1959) [monotypic] see Order Pleuromeiales F.A. Barkley (1939) 1 Family †Pleuromeyaceae Potonié (1901) see Family Pleuromeiaceae Potonié (1901)