Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Cnidaria Hatschek, 1888 - cnidarians
     Class Hydrozoa Owen, 1843
       Order Actinulida Swedmark & Teissier, 1959 - actinulidans see Suborder Actinulida Swedmark & Teissier, 1959
         Genus Otohydra Swedmark & Teissier, 1958