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

Fossorcastor L.D. Martin, 1987; L.Mioc. NA.

        †Fossorcastor brachyceps (Matthew, 1907)
            †Steneofiber brachyceps Matthew, 1907
            †Palaeocastor simplicidens (Matthew, 1907); Stirton, 1935
            †Capatanka brachyceps (Matthew); Macdonald, 1970
            †Fossorcastor brachyceps (Matthew); L.D. Martin, 1987


        †Fossorcastor fossor (Peterson, 1905)
            †Steneofiber fossor Peterson, 1905
            †Palaeocastor fossor (Peterson); Stirton, 1935
            †Palaeocastor fossor (Peterson); L.D. Martin, 1987
            †Fossorcastor fossor (Peterson), Xu, 1996
          including:Steneofiber simplicidens Matthew (1907)
              = †Palaeocastor simplicidens (Matthew) Stirton, 1935
              = †Palaeocastor simplicidens (Matthew) Macdonald, 1970
              = †Fossorcastor fossor Xu, 1996
            †Palaeocastor magnus Romer & McCormack, 1928
              = †Palaeocastor fossor (Peterson) Stirton, 1935
              = †Palaeocastor magnus Romer & McCormack; L.D. Martin, 1987
              = †Fossorcastor fossor (Peterson) Xu, 1996
            †Palaeocastor major Stirton, 1935
              = †Palaeocastor fossor (Peterson); Stirton, 1935
              = †Palaeocastor magnus Romer & McCormack; L.D. Martin, 1987
              = †Fossorcastor fossor (Peterson) Xu, 1996

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