Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Pisces
       Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
         1 Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
         2 Subclass Holocephali Bonaparte, 1832