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)
             1 Family †Utrechtiaceae G. Mapes & G.W. Rothwell (2003) see Family Walchiaceae Stur (1875)
             2 Family †Thucydiaceae Hernandez-Castillo, Rothwell & G. Mapes (2001) [monotypic]
             3 Family †Emporiaceae G. Mapes & Rothwell (2003) see Family Otoviciaceae Doweld (2001)
             4 Family †Majonicaceae Clement-Westerhof (1987)
             5 Family †Ullmanniaceae Němejc (1959) [monotypic]
             6 Family †Voltziaceae Arnold (1947)
             7 Family †Bartheliaceae G.W.Rothwell & Mapes (2001) [monotypic]
             8 Family †Ferugliocladaceae S.Archang. & Cúneo (1987)
             9 Family †Buriadiaceae Pant (1977)