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 see Infraphylum Vertebrata Lamarck, 1801
             Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
               Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
                 Cohort Euselachii Hay, 1902 - spined sharks and relatives see Subclass Euselachii Hay, 1902
                   Subcohort Neoselachii Compagno, 1977 - modern sharks and rays see Infraclass Elasmobranchii Bonaparte, 1838
                     Superorder Batoidea - rays see Subdivision Batoidea
                       Order Torpediniformes de Buen, 1926 - electric rays
                         Superfamily Narcinoidea see Family Narcinidae Gill, 1862
                           Family Narkidae Fowler, 1934 - sleeper rays
                             1 Genus Heteronarce Regan, 1921
                             2 Genus Narke Kaup, 1826
                             3 Genus Temera Gray, 1831
                             4 Genus Typhlonarke Waite, 1909