Mammalia Linnaeus, 1758
Coelostylops Ameghino, 1901
Edvardotrouessartia Ameghino, 1901
Homalostylops Ameghino, 1901
Notostylops Ameghino, 1897
Otronia Roth, 1901
Parastylops Ameghino, 1897
Satshatemnus Soria, 1989
Seudenius Simpson, 1935