After Schoch & Lucas, 1981, Carroll, 1988, McKenna & Bell, 1997, Alroy, 2002, and Fox & Naylor, 2003

<==o †Taeniodonta Cope, 1876 [taxonomic history]
   `--o †Stylinodontidae Marsh, 1875a [taxonomic history]
      |?- †Chungchienia sichuanica Chow, 1963; U.Eoc. EAs. [treated as a tillodont by McKenna & Bell, 1997]
      |-- †Alveugena carbonensis Eberle, 1999 sensu Alroy, 2002; L.Palaeoc. NA.
      `--+-- †Onychodectes tisonensis Coep, 1888 [incl. Onychodectes rarus Osborn & Earle, 1895 sensu Schoch, 1981, Schoch, 1986, Hunter et al., 1997, and Lucas et al., 1998] L.Paleoc. NA.
         `--+--o †Conoryctella Gazin, 1939; L.Paleoc. NA.
            |  |-- †C. dragonensis Gazin, 1939
            |  `-- †C. pattersoni Schoch & Lucas, 1981c
            |--o †Conoryctinae Wortman, 1896 [taxonomic history]
            |  |--o †Huerfanodon Schoch & Lucas, 1981b; L.Paleoc. NA.
            |  |  |-- †H. polecatensis Schoch & Lucas, 1981b
            |  |  `-- †H. torrejonius Schoch & Lucas, 1981b
            |  `--o †Conoryctes Cope, 1881 [incl. †Hexodon Cope, 1884 (non †Hexodon Olivier, 1789, a beetle (Arthropoda: Insecta. Coeloptera))]
            |     `-- †C. comma Cope, 1881 [incl. Triisodon heilprinianus Cope, 1882; Hexodon molestus Cope, 1884]
            `--o †Stylinodontinae Schlosser, 1911 [taxonomic history]
               |?- †Schowalteria clemensi Fox, & Naylor, 2003
               |-- †Schochia sullivani Lucas & Williamson, 1993; L.Paleoc. NA.
               `--+-- †Wortmania (Cope, 1885) Hay, 1899 [Hemiganus otariidens Cope, 1885; Wortmania otariidens Hay, 1899, Matthew, 1937, Lucas et al., 1998] L.Paleoc. NA.
                  `--+-- †Psittacotherium multifragum Cope, 1882 [taxonomic history]
                     `--+--o †Ectoganus Cope, 1874 [taxonomic history] U.Paleoc.-L.Eoc. NA.
                        |  |-- †E. bighornensis Schoch, 1981 [taxonomic history]
                        |  |-- †E. copei Schoch, 1981 [taxonomic history]
                        |  |-- †E. gliriformis Cope, 1874 [taxonomic history]
                        |  `-- †E. lobdelli (Simpson, 1929b) Gingerich, 1989 [taxonomic history]
                        `--o †Stylinodon Marsh, 1874b; L.-M.Eoc. NA.
                           |-- †S. mirus Marsh, 1874b [†Calamodon cylindrifer Cope, 1881; †Stylinodon cylindrifer (Cope); Wortman, 1897, T. White, 1952, and Guthrie, 1971; = †Stylinodon mirus Marsh; Schoch & Lucas, 1981c, Schoch, 1986, and Lucas et al., 1998]
                           `-- †S. inexplicatus Schoch & Lucas, 1981

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