Monotremata
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Domain: Eukaryota • Regnum: Animalia • Phylum: Chordata • Subphylum: Vertebrata • Infraphylum: Gnathostomata • Cladus: Osteichthyes • Superclassis: Tetrapoda • Cladus: Amniota • Classis: Mammalia • Subclassis: Prototheria • Ordo: Monotremata Thomas, 1892
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duckbilled platypus
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duckbilled platypus
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echidna
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shortbeak echidna