Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Craniata auct.
     Pisces
       Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838
         Order Torpediniformes de Buen, 1926 - electric rays
           1 Family Narkidae Fowler, 1934 - sleeper rays
           2 Family Narcinidae Gill, 1862 - electric rays
           3 Family Hypnidae Gill, 1862 - coffin rays
           4 Family Torpedinidae Henle, 1834 - torpedo electric rays