Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Cnidaria Hatschek, 1888 - cnidarians
     Class Hydrozoa Owen, 1843
       Order Siphonophora Eschscholtz, 1829 - siphonophorans
         Genus Agalma Eschscholtz, 1825
         Genus Apolemia Eschscholtz, 1829
         Genus Eudoxoides Huxley, 1859
         Genus Nectocarmen Alvarino, 1983
         Genus Physalia Lamarck, 1801
         Genus Rhizophysa Oken, 1815
         Genus Sphaeronectes Huxley, 1859
         Genus Stephalia Haeckel, 1888