life see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Empire Eukaryota (Chatton, 1925) see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Radiata (Linnaeus, 1758) Cavalier-Smith, 1983 [paraphyletic] - radiates see Kingdom Animalia Linnaeus, 1758
         Infrakingdom Coelenterata Leuckart, 1847 [paraphyletic?] see [unranked] Coelenterata
           Phylum Cnidaria Hatschek, 1888 [paraphyletic?] - cnidarians
             Subphylum Medusozoa Petersen, 1979
               Genus Hydra Linnaeus, 1758