After McKenna & Bell, 1997

<==o †Ischyromyidae Alston, 1876 [incl. Paramyida Haeckel, 1895; Paramyidae Miller & Gidley, 1918]
   |?- †Taishanomys Tong & Dawson, 1995
   |?- †Rapamys Wilson, 1940
   |?- †Anonymus baroni Storer, 1988
   |?- †Hulgana Dawson, 1962
   |-- †Microparamyinae Wood, 1962 [Microparamyidae Jaeger, 1988 (lapsus calami?)]
   `--+-- †Paramyinae [Paramyidae]
      `--+-- †Ailuravinae Michaux, 1968 [nom. correct. Wood, 1976 pro Ailuraviinae Michaux, 1968]
         `--o †Ischyromyinae Alston, 1876 [nom. transl. Schlosser, 1911 ex Ischyromyidae Alston, 1876] [Ischyromynae Trouessart, 1880]
            |-- †Titanotheriomys Matthew, 1910; U.Eoc. NA.
            `--o †Ischyromys Leidy, 1856 [Colotaxis Coep, 1873; Gymnoptychus Cope, 1873; ?Ischyrotomys Matthew, 1910]; U.Eoc.-L.Olig. NA.
               |-- †I. compressidens Wood, 1962
               |-- †I. horribilis Wood, 1962
               |-- †I. oweni Wood, 1962
               `-- †I. superbus (Osborn, Scott & Speir, 1878)

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