After McKenna & Bell, 1997, and Fox & Naylor, 2006, with species from Alroy, 2002, and Dykes, 2002

<==o †Stagodontidae Marsh, 1889 sensu lato
   |--o †Delphodon Simpson, 1927
   |  |-- †D. comptus (Marsh, 1889) Simpson, 1927 [Didelphodon comptus Marsh, 1889]
   |  `-- †D. praenuntius Russell, 1928
   `--+--o †Eodelphis Matthew, 1916; U.Cret. NA.
      |  |-- †E. browni Matthew, 1916 [= Eodelphis cutleri Simpson, 1929, L. Russell, 1952; Eodelphis browni Matthew; Clemens, 1966, Sahni, 1972, Clemens, 1979, Fox, 1981, Archibald, 1982, and Montellano, 1992]
      |  |-- †E. cutleri (Smith & Woodward, 1916) Sahni, 1972 [= Eodelphis browni Matthew;  Simpson, 1929, and L. Russell, 1952]
      |  |-- †E. sp.1
      |  `?- †E. sp.2
      `--o †Didelphodon Marsh, 1889 [Diaphorodon Archer, 1869; Stagodon Marsh, 1889; Thlaeodon Cope, 1892; Ectoconodon Osborn, 1898; Didelphops]
         |?- †D. tumidus
         |?- †D. validus
         |-- †D. coyi Fox & Naylor, 1986
         |-- †D. nitor (Marsh, 1889) Sahni, 1972
         |-- †D. padanicus (Cope, 1892) [Thlaeodon padanicus Cope, 1892]
         |-- †D. vorax Marsh, 1889
         `-- †D.? sp.

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