Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Superclass Pisces Linnaeus, 1758 - fishes
               Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
                 Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
                   Superorder Teleostei Bonaparte, 1836
                     Order Cypriniformes Rafinesque, 1810 - carps
                       Suborder Gymnotoidei Rafinesque, 1810
                         1 Family Electrophoridae - electric knifefishes see Family Gymnotidae Rafinesque, 1815
                         2 Family Gymnotidae Rafinesque, 1815 - nakedback knifefishes
                         3 Family Apteronotidae - ghost knifefishes
                         4 Family Rhamphichthyidae - sand knifefishes