[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlentera
       Phylum Nematophora Huxley, 1850
         Class Ctenophora Eschscholtz, 1829 see Phylum Ctenophora Eschscholtz, 1829
           Order Saccata
             Genus Pleurobrachia Fleming, 1822