Mammaliaformes Rowe 1988
Count: [*†*] 1o;1g;47s; †3f;12g;117s
   [crown] Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
  Count: [*†*] 1o;1g;47s; †3f;12g;113s
     Prototheria Gill 1872 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Subclass Prototheria Gill, 1872
    Count: [*†*] 2s; †3s
       [crown] Monotremata Bonaparte 1837 [Rowe 1988] see Order Monotremata Bonaparte, 1837
      Count: [*†*] 2s; †2s
         †Obdurodon insignis Woodburne & Tedford, 1975
        Count: -