living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
               Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
                 Order Notacanthiformes Goodrich, 1909 - spiny eels
                   Suborder Halosauroidei see Family Halosauridae Günther, 1868
                     Family Halosauridae Günther, 1868 - halosaurs
                       1 Genus Halosaurus Johnson, 1864 - halosaur
                       2 Genus Halosauropsis Collett, 1896
                       3 Genus Aldrovandia Goode & Bean, 1896