Phylum Chordata Bateson, 1885 - chordates
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   Subphylum Vertebrata Cuvier, 1812 - vertebrates
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     Class Mammalia Linnaeus, 1758 - mammals
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       Order Monotremata Bonaparte, 1837 - monotremes
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         Family †Kollikodontidae Flannery, Archer, Rich & Jones, 1995
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         Family Ornithorhynchidae Gray, 1825 - platypuses
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         Family Tachyglossidae Gill, 1872 - spiny anteaters
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