Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Subkingdom Pteridobiotina Britton & A. Br. (1896) Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001) Division Cycadophyta Bessey (1907) Class Cycadopsida Brongn. (1843) Subclass Zamiidae Doweld (2001) Order †Nilsoniales (1935), orth. inval. [monotypic] see Order Nilssoniales W.Zimm. (1930) Family †Nilsoniaceae Ziegensp. (1927), orth. inval. see Family Nilssoniaceae Ziegensp. (1925) Genus †Nilsonia Brongn. (1825), orth. inval. see Genus Nilssonia Brongn. (1825)