After McKenna & Bell, 1997, and Alroy, 2002

Palaeosinopa Matthew, 1901
        †Palaeosinopa Matthew, 1899 (nomen nudum)
      ?including:Niphredil Van Valen, 1978

        †Palaeosinopa dorri Gingerich, 1980c
            †Palaeosinopa dorri Gingerich; Alroy, 2002

        †Palaeosinopa lutreola Matthew, 1918b [non 1899]
            †Palaeosinopa lutreola Matthew; Alroy, 2002

        †Palaeosinopa incerta Bown & Schankler, 1982
            †Palaeosinopa incerta Bown & Schankler; Alroy, 2002

        †Palaeosinopa simpsoni Van Valen, 1967
            †Palaeosinopa simpsoni Van Valen, 1967
            †Paleotomus senior; Gingerich, 1980c
            †Paleotomus senior; Krause & Gingerich, 1983
            †Palaeosinopa simpsoni Van Valen; Krause & Maas, 1990
            †Palaeosinopa simpsoni Van Valen; Alroy, 2002

        †Palaeosinopa didelphoides (Cope, 1881)
            †Ictops didelphoides Cope, 1881
            †Palaeosinopa didelphoides; McKenna, 1960
            †Palaeosinopa didelphoides (Cope); Alroy, 2002

        †Palaeosinopa veterrima Matthew, 1901
            †Palaeosinopa veterrima Matthew, 1901
            †Palaeosinopa didelphoides; Delson, 1971
            †Palaeosinopa veterrima; Schankler, 1980
            †Palaeosinopa veterrima Matthew; Alroy, 2002

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