Class Mammalia Linnaeus, 1758 - mammals
Count: 21o19f27g86s1ss; †2f2g2s
   Order Monotremata Bonaparte, 1837 - monotremes
  Count: [s] 2f;3g;3s;1ss; †2g;2s
     Family Ornithorhynchidae Gray, 1825 - platypuses
    Count: [*] 1g;1s; †2g;2s
       1 Genus Ornithorhynchus Blumenbach, 1800 - duck-billed platypus
      Count: [*] 1s
       2 ?Genus †Steropodon Archer, Flannery, Ritchie & Molnar, 1985
      Count: †1s
       3 Genus †Obdurodon Woodburne & Tedford, 1975
      Count: †1s