After McKenna & Bell, 1997

    Rattus Fischer de Waldhein, 1803
        Rattus Frisch, 1775 (nomen nudum)
      including:
        Acanthomys Gray, 1863
            (non Acanthomys Lesson, 1842, a syn. of Acomys)
            (non Acanthomys) Tokuda, 1941, a syn. of Tokudaia
        Epimys Trouessart, 1881
        Christomys Sody, 1941
        Ciromys Sody, 1941
        Geromys Sody, 1941
        Mollicomys Sody, 1941
        Pullomys Sody, 1941
        Octomys Sody, 1941
            (non Octomys Thomas, 1920, a genus of Octodontidae)
        Togomys Dieterlen, 1986

Reference(s):