• Megalibgwilia ramsayi (Owen, 1884) †
• Megalibgwilia robusta (Dun, 1895) †
• Monotrematum subamericanum †
• Obdurodon dicksoni †
• Obdurodon insignis †
• Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus brevirostris Ogilby, 1832 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus crispus Macgillivray, 1827 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus fuscus Peron, 1807 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus laevis Macgillivray, 1827 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus novaehollandiae Lacepede, 1800 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus paradoxus Blumenbach, 1800 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Ornithorhynchus rufus Peron, 1807 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Platypus anatinus Shaw, 1799 accepted as Ornithorhynchus anatinus (Shaw, 1799)
• Steropodon galmani †
• Tachyglossus acanthion accepted as Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus aculeata accepted as Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus bruijni Peters & Doria, 1876 accepted as Zaglossus bruijnii (Peters & Doria, 1876)
• Tachyglossus ineptus accepted as Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus lawesii Ramsay, 1877 accepted as Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus multiaculeatus accepted as Tachyglossus aculeatus (Shaw, 1792)
• Tachyglossus setosus (Geoffroy, 1803) accepted as Tachyglossus aculeatus (Shaw, 1792)
• Teinolophos trusleri Rich et al., 1997 †
• Zaglossus attenboroughi Flannery & Groves, 1998
• Zaglossus bartoni (Thomas, 1907)
• Zaglossus bruijni (Peters & Doria, 1876) accepted as Zaglossus bruijnii (Peters & Doria, 1876)
• Zaglossus bruijnii (Peters & Doria, 1876)
• Zaglossus hacketti (Glauert, 1914) †
• Zaglossus harrisoni Scott & Lord, 1922 †
• Zaglossus owenii (Krefft, 1868) †
• Zaglossus ramsayi Owen, 1884 † accepted as Megalibgwilia ramsayi (Owen, 1884) †
• Zaglossus robusta Dun, 1895 † accepted as Megalibgwilia robusta (Dun, 1895) †
• Zaglossus robustus Dun, 1895 † accepted as Megalibgwilia robusta (Dun, 1895) †