[Kingdom] Animalia Linnaeus, 1758 - animals
Status: extant
   Grade Enterozoa
  Status: extant
     Grade Cœlentera
    Status: extant
       Phylum Nematophora Huxley, 1850
      Status: extant
         Class Hydromedusæ see Class Hydrozoa Owen, 1843
        Status: extant
           Order Siphonophora Eschscholtz, 1829 - siphonophorans
          Status: extant
             Genus Physophora Péron & Lesueur, 1807
            Status: extant