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 †Utrechtiaceae G. Mapes & G.W. Rothwell (2003) see Family Walchiaceae Stur (1875)
               01 Genus †Carpentiera Nemejc & Augusta (1934)
               02 Genus †Czatkalostrobus L.I. Savizkaja (1975)
               03 Genus †Culmitzschia Ullrich (1964)
               04 Genus †Ernestiodendron Florin (1934)
               05 Genus †Lebachia Florin (1938), nom. illeg. see Genus Walchia Sternb. (1825)
               06 Genus †Moyliostrobus C.N.Mill. & J.T.Br. (1973)
               07 Genus †Ortiseia Florin (1964)
               08 Genus †Utrechtia G.W.Rothwell & G. Mapes (2003)
               09 Genus †Walchia Sternb. (1825)
               10 Genus †Walchianthus Florin (1940)
               11 Genus †Walchiostrobus Florin (1940)