Kingdom [Plantae] Haeckel (1866) - plants
   Division Gymnospermophyta Cleal (1994) - seed plants see Infraphylum Gymnospermae auct.
     Class †
       Order †Callistophytales Rothwell (1981) [monotypic]
         Family †Callistophytaceae Stidd & J.W.Hall (1970), nom. cons. prop.