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Monotypic taxon: Subclass Prototheria Gill, 1872 (mammal)
Classification by:

Class Mammalia Linnaeus, 1758 - mammals
   Subclass Prototheria Gill, 1872 [monotypic] - monotremes
     1 Order Monotremata Bonaparte, 1837 - monotremes

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Last updated: 28 Aug 2026