Mammaliaformes Rowe 1988, nom. cl. inval. see Clade Mammaliaformes Rowe 1988 [Rowe 2020]
Count: [g†g] 1c;24o;125f;1081g; ‡1o;6f;43g; †24o;301f;4057g;1s
   [crown] Class Mammalia Linnaeus, 1758 - mammals
  Count: [g†g] 24o;125f;1081g; ‡1o;6f;43g; †21o;294f;4034g;1s
     Subclass Prototheria Gill, 1872 - monotremes
    Count: [g†g] 2o;2f;3g; †3g
       Order Platypoda Gill, 1872 - platypuses see Order Monotremata Bonaparte, 1837
      Count: [g†g] 1f;1g; †3g
         Family Ornithorhynchidae Gray, 1825 - platypuses
        Count: [g†g] 1g; †3g
           Genus †Obdurodon Woodburne & Tedford, 1975
          Count: -