After McKenna & Bell, 1997, and Alroy, 2002

Simidectes Stock, 1933
        †Pleurocyon Peterson, 1919
            nonPleurocyon Mercerat, 1917 (= †Theriodictis Mercerat, 1891 [Carnivora: Canidae])
        †Sespecyon Stock, 1933 (nomen nudum)
        †Petersonella Kraglievich, 1948 (nomen novii pro Pleurocyon Peterson, 1919)

        †Simidectes magnus (Peterson, 1919)
            †Pleurocyon magnus Peterson, 1919
            †Petersonella magna (Peterson); Kraglievich, 1948
            †Simidectes magnus (Peterson); Coombs, 1971
            †Simidectes magnus (Peterson); Gustafson, 1979
            †Simidectes magnus (Peterson); J. Wilson & Stevens, 1986
            †Simidectes magnus (Peterson); Westgate, 1990
            †Simidectes magnus (Peterson); Alroy, 2002

        †Simidectes medius (Peterson, 1919)
            †Pleurocyon medius Peterson, 1919
            †Petersonella media (Peterson); Kraglievich, 1948
            †Simidectes medius (Peterson); Coombs, 1971
            †Simidectes medius (Peterson); Gustafson, 1979
            †Simidectes medius (Peterson); Alroy, 2002

        †Simidectes merriami (Stock, 1933b)
            †Pleurocyon merriami Stock, 1933b
            †Simidectes merriami (Stock); Coombs, 1971
            †Simidectes merriami (Stock); Gustafson, 1979
            †Simidectes merriami (Stock); Alroy, 2002

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