Mammalia Linnaeus, 1758
Henricosbornia Ameghino, 1901
Othnielmarshia Ameghino, 1901
Peripantostylops Ameghino, 1904
Postpithecus Ameghino, 1901
Simpsonotus Pascual, Vucetich & Fernandez, 1979
