Antifer Ameghino, 1889 † (original description)
Asterostemma Ameghino, 1889 † (original description)
Bothriomys Ameghino, 1889 accepted as Graomys Thomas, 1916 (original description)
Callodontomys Ameghino, 1889 † (original description)
Cardiotherium Ameghino, 1889 † accepted as Cardiatherium Ameghino, 1883 † (original description)
Cochlops Ameghino, 1889 † (original description)
Delotherium Ameghino, 1889 † (original description)
Dideilotherium Ameghino, 1889 † accepted as Delotherium Ameghino, 1889 † (original description)
Dimerodon Ameghino, 1889 accepted as Didelphis Linnaeus, 1758 (original description)
Diocartherium Ameghino, 1889 † (original description)
Diplotremus Ameghino, 1889 † (original description)
Epanorthus Ameghino, 1889 † (original description)
Epieuryceros Ameghino, 1889 † (original description)
Euphilus Ameghino, 1889 † (original description)
Eutomodus Ameghino, 1889 † (original description)
Hamela Ameghino, 1889 accepted as Hippocamelus Leuckart, 1816 (original description)
Hipphaplus Ameghino, 1889 † (original description)
Hypposhyus Ameghino, 1889 † (original description)
Icochilus Ameghino, 1889 † (original description)
Lomaphorus Ameghino, 1889 † (original description)
Macropristis Ameghino, 1889 † (original description)
Mesembriotherium Ameghino, 1889 † (original description)
Mesotherium Ameghino, 1889 † (original description)
Mirmecobius Ameghino, 1889 accepted as Myrmecobius Waterhouse, 1836 (original description)
Necromys Ameghino, 1889 (original description)
Neoracanthus Ameghino, 1889 † accepted as Megatherium Cuvier, 1796 † (original description)
Neothoracophorus Ameghino, 1889 † (original description)
Notictis Ameghino, 1889 † (original description)
Olenopsis Ameghino, 1889 † (original description)
Orthomyctera Ameghino, 1889 † (original description)
Pachyrucos Ameghino, 1889 † accepted as Pachyrukhos Ameghino, 1885 † (original description)
Palaeocavia Ameghino, 1889 † (original description)
Paraceros Ameghino, 1889 † (original description)
Paranomys Ameghino, 1889 † (original description)
Patriarchus Ameghino, 1889 † (original description)
Pedotherium Ameghino, 1889 † (original description)
Phanotherus Ameghino, 1889 † (original description)
Plataeomys Ameghino, 1889 † accepted as Plataeomys Ameghino, 1881 † (original description)
Plataëomys Ameghino, 1889 † accepted as Plataeomys Ameghino, 1889 † accepted as Plataeomys Ameghino, 1881 † (original description)
Praeuphractus Ameghino, 1889 † accepted as Proeuphractus Ameghino, 1886 † (original description)
Pseudoeuryurus Ameghino, 1889 † (original description)
Ptyssophorus Ameghino, 1889 accepted as Reithrodon Waterhouse, 1837 (original description)
Rabdiodon Ameghino, 1889 † (original description)
Scelidodon Ameghino, 1889 † (original description)
Sphaeromys Ameghino, 1889 † (original description)
Stenodontherium Ameghino, 1889 † accepted as Scelidotherium Owen, 1839 † (original description)
Stilauchenia Ameghino, 1889 † (original description)
Stilodon Ameghino, 1889 † (original description)
Zaedypus Ameghino, 1889 † (original description)
Zamicrus Ameghino, 1889 † (original description)
Zaphilus Ameghino, 1889 † (original description)