Phylum [Vertebrata] (Lamarck, 1801)
   1 Class Agnatha Cope, 1889
   2 Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
   3 Class †Acanthodii Owen, 1846
   4 Class †Placodermi McCoy, 1848
   5 Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
   6 Class Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825
   7 Class Reptilia Linnaeus, 1758 - reptiles
   8 Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   9 Class Mammalia Linnaeus, 1758 - mammals