Apterodytes Ameghino, 1901 accepted as Aptenodytes Miller, 1778 (original description)
Argyrohippus Ameghino, 1901 † (original description)
Astrapothericulus Ameghino, 1901 † (original description)
Cochilius Ameghino, 1901 † (original description)
Cramauchenia Ameghino, 1901 † (original description)
Eomannodon Ameghino, 1901 † (original description)
Eosteiromys Ameghino, 1901 † accepted as Eosteiromys Ameghino, 1902 † (original description)
Hapaloides Ameghino, 1901 † accepted as Hapaloides Ameghino, 1902 † (original description)
Homunculites Ameghino, 1901 † (original description)
Pachybiotherium Ameghino, 1901 † accepted as Pachybiotherium Ameghino, 1902 † (original description)
Pitheculites Ameghino, 1901 † accepted as Pitheculites Ameghino, 1902 † (original description)
Pseudothylacynus Ameghino, 1901 † (original description)