organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Viridaeplantae Cavalier-Sm. (1981) - green plants see [unranked] Viridiplantae Cavalier-Smith, 1981
         Land plants
           Coniferophytes
             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)
               3 Family †Emporiaceae G. Mapes & Rothwell (2003) see Family Otoviciaceae Doweld (2001)
               4 Family †Majonicaceae Clement-Westerhof (1987)
               5 Family †Ullmanniaceae Němejc (1959)
               6 Family †Bartheliaceae G.W.Rothwell & Mapes (2001)
               7 Family †Ferugliocladaceae S.Archang. & Cúneo (1987)
               8 Family †Buriadiaceae Pant (1977)