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 Pinophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) [monotypic] Class Pinopsida Burnett (1835) Order †Voltziales Andreánszky (1954) Family †Thucydiaceae Hernandez-Castillo, Rothwell & G. Mapes (2001) [monotypic] 1 Genus †Thucydia G.R. Hernandez-Castillo, G.W.Rothwell & G. Mapes (2001)