Mammaliaformes Rowe 1988
Ref: M.C. McKenna & S.K. Bell, 1997: 511
   [crown] Class Mammalia Linnaeus, 1758 - mammals
  Ref: M.C. McKenna & S.K. Bell, 1997: 35
     Subclass Prototheria Gill, 1872 - monotremes
    Ref: M.C. McKenna & S.K. Bell, 1997: 35
       1 Order Platypoda Gill, 1872 - platypuses see Order Monotremata Bonaparte, 1837
      Ref: M.C. McKenna & S.K. Bell, 1997: 35
       2 Order Tachyglossa Gill, 1872 see Order Monotremata Bonaparte, 1837
      Ref: M.C. McKenna & S.K. Bell, 1997: 35