Kingdom [Plantae] Haeckel (1866) - plants
   Division Gymnospermophyta Cleal (1994) - seed plants see Infraphylum Gymnospermae auct.
     Class †Lagenostomopsida [monotypic]
       Order †Lagenostomales
         1 Family †Elkinsiaceae G.W. Rothwell, Scheckler & W.H. Gillespie (1989) see Family Moresnetiaceae Němejc (1963)
         2 Family †Genomospermaceae A.G. Long see Family Moresnetiaceae Němejc (1963)
         3 Family †Eospermaceae
         4 Family †Lagenostomaceae
         5 Family †Physostomaceae