After McKenna & Bell, 1997

<==o †Cylindrodontidae Miller & Gidley, 1918 [taxonomic history]
   |?- †Dawsonomys woodi Gazin, 1961 [Dawsonemys (lapsus calami)]; L.Eoc. NA.
   |?- †Downsimys margolisi L. Flynn, Jacobs & Cheema, 1986; L.Mioc. As. [also treated as anomaluromorphan rodent]
   |--o †Cylindrodontinae Miller & Gidley, 1918 [taxonomic history]
   |  |--o †Pseudocylindrodon Burke, 1935; M.-U.Eoc. NA., U.Eoc. As.
   |  |  |?- †P. medius Burke, 1938
   |  |  |?- †P. mongolicus Kowalski
   |  |  |?- †P. pintoensis Ferrusquia, 1984 [Jaywilsonomys pintoensis Ferrusquia & A.E. Wood, 1969]
   |  |  |?- †P. texanus A.E. Wood, 1974
   |  |  |?- †P. tobeyi Black, 1970b
   |  |  |-- †P. citofluminis Storer, 1984
   |  |  `--+-- †P. lateriviae Storer, 1988
   |  |     `-- †P. neglectus Burke, 1935 [incl. Pseudocylindrodon sylvaticus L. Russell, 1954 = Pseudocylindrodon neglectus Burke; A.E. Wood, 1980, and Emry & Korth, 1996a]
   |  |--o †Ardynomys Matthew & Granger, 1925; U.Eoc.-U.Olig. As., U.Eoc. NA.
   |  |  |-- †A. chihi
   |  |  |-- †A. occidentalis Burke, 1936
   |  |  |-- †A. olseni
   |  |  `-- †A. saskatchewaensis (Lambe, 1908) [Sciurus saskatchewaensis Lambe, 1908; Prosciurus saskatchewaensis (Lambe) L. Russell, 1934, A.E. Wood, 1937, A.E. Wood, 1962, and A.E. Wood, 1980; Ardynomys saskatchewaensis (Lambe) Storer, 1978, Emry & Korth, 1996a, and Storer, 1996]
   |  `--o †Cylindrodon Douglass, 1901; U.Eoc. NA.
   |     |-- †C. collinus L. Russell, 1972 [incl. Prosciurus altidens L. Russell, 1972; Plesispermophilus altidens (Russell) A.E. Wood, 1980; = Cylindrodon collinus Russell; Storer, 1978, and Emry & Korth, 1996a]
   |     |-- †C. fontis Douglass, 1901
   |     |-- †C. natronensis Emry & Korth, 1996a
   |     |-- †C. nebraskensis Hough & Alf, 1956 [= Cylindrodon fontis Douglass; A.E. Wood, 1980] [incl. Cylindrodon galbreathi Ostrander, 1983a; = Cylindrodon nebraskensis Hough & Alf; Korth, 1992c, and Emry & Korth, 1996a]
   |     `-- †C. solarborus Emry & Korth, 1996a
   `--o †Jaywilsonomyinae A.E. Wood, 1974
      |--o †Mysops Leidy, 1871d [†Syllophodus Cope, 1881]; M.Eoc. NA.
      |  |-- †M. fraternus Leidy, 1832 [Syllophodus fraternus (Leidy); Cope (1883); Tillomys fraternus (Leidy) Troxell, 1923c; Mysops fraternus Leidy; R.W. Wilson, 1938a, R.W. Wilson, 1938b, and Gazin, 1976]
      |  |-- †M. minimus Leidy, 1871d; R.W. Wilson, 1938b [Syllophodus minimus (Leidy) Cope, 1881]
      |  |-- †M. parvus (Marsh, 1872) [Tillomys parvus Marsh, 1872; Mysops parvus (Marsh) R.W. Wilson, 1938a, R.W. Wilson, 1938b, and Gazin, 1976]
      |  `-- †M. wilsoni (A.E. Wood, 1962) Korth, 1984 [Microparamys wilsoni A.E. Wood, 1962]
      |--o †Pareumys Peterson, 1919; M.Eoc. NA.
      |  |-- †P. boskeyi (A.E. Wood, 1973) Korth, 1994c [Mysops boskeyi A.E. Wood, 1973]
      |  |-- †P. grangeri Burke, 1935a
      |  |-- †P. guensburgi Black, 1970a
      |  |-- †P. milleri Peterson, 1919
      |  `-- †P. troxelli Burke, 1935a
      |-- †Anomoemys lohiculus Wang, 1986; M.Eoc. NA., L.Olig. As.
      |-- †Jaywilsonomys ojinagaensis Ferrusquía-Villafranca & A.E. Wood, 1969; U.Eoc. NA.
      `-- †Sespemys thurstoni R.W. Wilson, 1934; U.Olig. NA.

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