[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlentera
       Phylum Nematophora Huxley, 1850
         Class Discomedusæ [monotypic]
           Order Discomedusæ
             1 Genus Rhizostoma Cuvier, 1799
             2 Genus Aurelia Lamarck, 1816