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 †Progymnospermophyta Bold et al. see Phylum Progymnospermophyta Lang (1925)
         Class †Progymnospermopsida Beck (1960) see Clade Pan-Spermatophyta Cantino & Donoghue 2007 [Cantino, Doyle & Donoghue 2020]
           Order †Protopityales Walton (1957) [monotypic]
             1 Family †Protopityaceae Solms ex D.H.Scott (1900) [monotypic]