After McKenna & Bell, 1997, and Morlo & Gunnell, 2005

<==o †Limnocyoninae Wortman, 1902 sensu McKenna & Bell, 1997 [Limnocyonidae Gazin, 1946; Limnocyonini Van Valen, 1966]
   |?- †“Thinocyonsichowensis Chow, 1975
   |?- †Mechaeroidini [Oxyaenidae?: Mechaeroidinae sensu Gunnell, 1998]
   `--o †Limnocyonini
      |?- †Prolaena parva Xu, Yan, Zhou, Han & Zhang, 1979; M.Eoc. EAs.
      |?- †Thereutherium thylacodes Filhol, 1876; L.Eoc.-Olig. Eu.
      |--o †Prolimnocyon Matthew, 1915; ?Pal., E.Eoc. NAm.
      |  |-- †P. atavus Matthew, 1915
      |  |-- †P. antiquus
      |  |-- †P. chowi meng, Chai & Wyss, 1998
      |  |-- †P. elisabethae Gazin, 1952
      |  |-- †P. eerius Gingerich, 1989
      |  `-- †P. haematus Gingerich & Deutsch, 1989
      `--+-- †Iridodon datzae
         `--+--o †Thinocyon Marsh, 1872 [Entomodon Marsh, 1872] ?M.Eoc. EAs., M.Eoc. NAm.
            |  |-- †T. velox Marsh, 1872 [T. cledensis, T. mustelius Matthew, 1909b, T. wyomingensis]
            |  |-- †T. cledensis
            |  |-- †T. medius (Wortman, 1902) [T. submedius]
            |  |-- †T. mustelinus
            |  `-- †T. comptus
            `--+--o †Limnocyon Marsh, 1872 [Telmatocyon Marsh, 1899] M.Eoc. NAm.
               |  |-- †L. verus Marsh, 1872
               |  `-- †L. cuspidens Morlo & Gunnell, 2005
               `--+-- †“Limnocyon” potens [incl. ?Oxyaenodon wortmani Van Valen, 1966]
                  `-- †Oxyaenodon dysodus Wortman, 1899 [Oxyaenodon dysodus Matthew, 1899, nomen nudum; incl. O. dysclerus Hay, 1902]

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