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
       ?Genus †Steropodon Archer, Flannery, Ritchie & Molnar, 1985
      Count: †1s
         †Steropodon galmani Archer, Flannery, Ritchie & Molnar, 1985
        Count: -