After McKenna & Bell, 1997, and Alroy, 2002

Ectoganus Cope, 1874
        †Camalodon Cope, 1874
        †Dryptodon Marsh, 1876
        †Conicodon Cope, 1894
      including?:Lampadophorus Patterson, 1949

        †Ectoganus bighornensis Schoch, 1981
            †Ectoganus copei Schoch; Schoch, 1986
            †Ectoganus bighornensis Schoch; Gingerich, 1989

        †Ectoganus copei Schoch, 1981
          including:Ectoganus bighornensis Schoch; Schoch, 1986

        †Ectoganus gliriformis Cope, 1874
            †Ectoganus gliriformis Cope, 1874
            †Calamodon arcamaenus Cope, 1874
              = †Ectoganus gliriformis Cope; Gazin, 1936, Schoch, 1981, and Schoch, 1986
            †Calamodon novomehicanus Cope, 1874
              = †Ectoganus novomehicanus (Cope) Cope, 1877
              = †Ectoganus gliriformis Cope; Gazin, 1936, Schoch, 1981, and Schoch, 1986
            †Calamodon simplex Cope, 1874
              = †Conicodon simplex (Cope); Cope, 1894
              = †Ectoganus simplex (Cope); Gazin, 1936, Guthrie, 1967, and Schankler, 1980
              = †Ectoganus gliriformis Cope; Schoch, 1981, Schoch, 1986, and Lucas et al., 1998
            †Dryptodon crassus Marsh, 1876
              = †Ectoganus gliriformis Cope; Schoch, 1981, and Schoch, 1986

        †Ectoganus lobdelli (Simpson, 1929b) Gingerich, 1989
            †Psittacotherium lobdelli Simpson, 1929b
              = †Lampadophorus lobdelli (Simpson); Patterson, 1949, and Rose, 1981
              = †Ectoganus gliriformis Cope; Schoch, 1981b, Schoch, 1985, and Schoch, 1986
              = †Ectoganus lobdelli (Simpson); Gingerich, 1989
            †Lampadophorus expectatus Patterson, 1949
              = †Ectoganus gliriformis Cope; Schoch, 1981, Kihm, 1984, and Schoch, 1986
              = †Ectoganus lobdelli (Simpson); Gingerich, 1989

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