After McKenna & Bell, 1997 and Alroy, 2002-2005

Pseudopalaeocastor L.D. Martin, 1987
        †Steneofiber (in partim)
        †Palaeocastor (in partim)
        †Nannasfiber Xu, 1996

        †Pseudopalaeocastor osmagnusNannasfiber osmagnus Xu, 1996
            †Pseudopalaeocastor osmagnus (Xu) Korth, 2002


        †Pseudopalaeocastor barbouri (Peterson, 1905)
            †Steneofiber barbouri Peterson, 1905
            †Palaeocastor barbouri (Peterson); Stirton, 1935
            †Pseudopalaeocastor barbouri (Peterson) L.D. Martin, 1987
          including:Palaeocastor milleri Olson, 1940
              = †Capacikala milleri (Olson); Macdonald, 1963
              = †Pseudopalaeocastor barbouri (Peterson) L.D. Martin, 1987
            †Nannasfiber ostellatus Xu, 1996
              = †Pseudopalaeocastor barbouri Korth, 2002

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