Astegotherium Ameghino, 1902 † (original description)
Dimerostephanos Ameghino, 1902 † accepted as Isotemnus Ameghino, 1897 † (original description)
Interhippus Ameghino, 1902 † (original description)
Lomaphorelus Ameghino, 1902 † (original description)
Lophiodonticulus Ameghino, 1902 † (original description)
Nemolestes Ameghino, 1902 † (original description)
Odontomysops Ameghino, 1902 † (original description)
Pleurystomus Ameghino, 1902 † (original description)
Pliodolops Ameghino, 1902 † (original description)
Posteutatus Ameghino, 1902 † (original description)
Procladosictis Ameghino, 1902 † (original description)
Prohyracotherium Ameghino, 1902 † (original description)
Promysops Ameghino, 1902 † (original description)
Proplanodus Ameghino, 1902 † (original description)