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 †Pteridospermatophyta Meyen
         Class †Phasmatocycadopsida Doweld (2001)
           Order †Gigantopteridales X.X.Li & Z.Q. Yao (1983)
             Family †Gigantopteridaceae Koidzumi (1936)
               1 Genus †Aculeovinea H.Q.Li & D.W.Taylor (1998)
               2 Genus †Cardioglossum Koidz. (1934)
               3 Genus †Cathaysiopteris Koidz. (1934)
               4 Genus †Evolsonia Mamay (1989)
               5 Genus †Gigantonomia X.X.Li & Z.Q.Yao (1983)
               6 Genus †Gigantopteris Geyler (1886)
               7 Genus †Jiaochengia Z.-Q. Wang (1999)
               8 Genus †Vasovinea H.Q.Li & D.W.Taylor (1999)
               9 Genus †Zeilleropteris Koidz. (1936)