Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Superphylum Cycadophytanae Doweld (2001)
           Subphylum †Leptostrobophytina Doweld (2001) [monotypic]
             1 Class †Leptostrobopsidaᵀ Doweld (2001) [monotypic]