Argyrolagus Ameghino, 1904 † accepted as Microtragulus Ameghino, 1904 † (original description)
Epipeltephilus Ameghino, 1904 † (original description)
Hemistylops Ameghino, 1904 † (original description)
Hyperdidelphys Ameghino, 1904 † (original description)
Lophocoelus Ameghino, 1904 † (original description)
Lopholambda Ameghino, 1904 † (original description)
Neonematherium Ameghino, 1904 † (original description)
Notoamphicyon Ameghino, 1904 † (original description)
Orthoarthrus Ameghino, 1904 † (original description)
Pachynasua Ameghino, 1904 † (original description)
Paradidelphys Ameghino, 1904 † (original description)
Parahyaenodon Ameghino, 1904 † (original description)
Paramyocastor Ameghino, 1904 † (original description)
Paranauchenia Ameghino, 1904 † (original description)
Parasteiromys Ameghino, 1904 † (original description)
Paratemnus Ameghino, 1904 † (original description)
Phoenixauchenia Ameghino, 1904 † (original description)
Prepotheriops Ameghino, 1904 † (original description)
Proarctotherium Ameghino, 1904 † (original description)
Proectocion Ameghino, 1904 † (original description)
Progarzonia Ameghino, 1904 † (original description)
Promacrauchenia Ameghino, 1904 † (original description)
Promyrmephagus Ameghino, 1904 † (original description)
Proprepotherium Ameghino, 1904 † (original description)
Protamandua Ameghino, 1904 † (original description)
Rathymotherium Ameghino, 1904 † (original description)
Scelidotheriops Ameghino, 1904 † (original description)
Sigmomys Ameghino, 1904 † accepted as Eusigmomys Ameghino, 1905 † (original description)
Simplimus Ameghino, 1904 † (original description)
Tonorhinus Ameghino, 1904 † accepted as Notorhinus Roth, 1903 † (original description)
Toxotemnus Ameghino, 1904 † (original description)