After McKenna & Bell, 1997, and Alroy, 2002
    †Psittacotherium Cope, 1882
        non †Hemicanus Wortman, 1897
        †Psittacotherium multifragum Cope, 1882
            †Hemiganus vultuosus Cope, 1882
              = † Psittacotherium multifragum (Cope); Wortman, 1897, Matthew, 1937, Schoch, 1981a, and Schoch, 1986
            †Psittacotherium aspasiae Cope, 1882; Matthew, 1937, Wortman, 1897, Schoch, 1981a, and Schoch, 1986
              = †Psittacotherium multifragum Cope; Lucas et al., 1998
            †Psittacotherium megalodus Cope; 1887
              = †Psittacotherium multifragum Cope; Wortman, 1897, Schoch, 1981a, and Schoch, 1986
Reference(s):
- Alroy, J., 2002: North American fossil mammal systematics database.
 –iNet: North American fossil mammal systematics database: http://www.nceas.ucsb.edu/~alroy/nafmsd.html
- McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
 –Columbia University Press, New York, 1997, xii-631
 
