After McKenna & Bell, 1997

    Calomys Waterhouse, 1837 sensu stricto?
        Mus (Calomys) Waterhouse, 1837, Hesperomys Waterhouse, 1839
        Callomys Gray, 1843 (non Callomys d'Orbigny & Geoffroy Saint-Hilaire, 1830, a chinchillid)
      including:Necromys Ameghino, 1889

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