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 †Pachytestopsida Doweld (2001)
           Order †Pachytestales Doweld (2001)
             Family †Pachytestaceae Doweld (2001), nom. cons. prop.
               1 Genus †Alethopteris Sternb. (1825)
               2 Genus †Callipteris Brongn. (1849), nom. illeg.
               3 Genus †Cyclopteris Brongn. (1828), nom. cons.
               4 Genus †Medullosa Cotta (1832)
               5 Genus †Neuropteris (Brongn.) Sternb. (1825), nom. cons., orth. cons.
               6 Genus †Odontopteris (Brongn.) Sternb. (1825)
               7 Genus †Pachytesta Brongn. (1874)
               8 Genus †Protoblechnum Lesq. (1880)
               9 Genus †Whittleseya Newberry (1853)