Phylum Chordata Bateson, 1885 - chordates
Count: -
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
  Count: -
     Superclass Homotherma
    Count: -
       Class Mammalia Linnaeus, 1758 - mammals
      Count: -
         1 Subclass Prototheria Gill, 1872 - monotremes
        Count: [o] 1o
         2 Subclass Theria Parker & Haswell, 1897
        Count: -