[Animalia] Linnaeus, 1758 - animals
   Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Bilateralia
         Chordata Bateson, 1885 - chordates
           Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
             Mammalia Linnaeus, 1758 - mammals
               Prototheria Gill, 1872 - monotremes
                 Monotremata Bonaparte, 1837 - monotremes
                   Ornithorhynchidae Gray, 1825 - platypuses
                     1 Ornithorhynchus Blumenbach, 1800 - duck-billed platypus