After Scott, Fox & Youzwyshyn, 2002

Bessoecetor Simpson, 1936; Scott, Fox & Youzwyshyn, 2002
        †Propalaeosinopa Simpson, 1927
        †Thylacodon Matthew & Granger, 1921 sensu Russell & Rutherford, 1927 (in partim)
        †Palaeosinopa Matthew, 1901 sensu Simpson, 1935 (in partim)
        †Palaeictops Matthew, 1899 sensu Van Valen, 1967 (in partim)

    †Bessoecetor septentrionalis (Russell, 1929); Scott, Fox & Youzwyshyn, 2002
        †Thylacodon sp. nov. Russell, in Rutherford, 1927
        †Diacodon septentrionalis Russell, 1929
        †Palaeosinopa diluculi Simpson, 1935a
        †Bessoecetor thompsoni Simpson, 1936
        †Bessoecetor diluculi (Simpson, 1935a); Simpson, 1937
        †Propalaeosinopa albertensis Simpson, 1927; Van Valen, 1967
        †Propalaeosinopa thompsoni (Simpson); Rose, 1981a
        †Propalaeosinopa diluculi (Simpson); Rose, 1981a
        †Propalaeosinopa septentrionalis (Russell); Fox, 1990

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