[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Vertebrata (Lamarck, 1801)
         Branch Craniata Linnaeus, 1758
           Grade Gnathostoma
             Subgrade Heterodactyla branchiata
               Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
                 Subclass Selachii see Subdivision Selachii
                   Order Raii
                     1 Genus Raia Cuvier, 1798 see Genus Raja Linnaeus, 1758
                     2 Genus Torpedo Duméril, 1806