McKenna & Bell, 1997, with recent species from Nowak, 1991
<==o Tamiasciurini Pocock, 1923 `--o Tamiasciurus Trouessart, 1880; M.Pleist.-R. NA. (North American re squirrel; Douglas' squirrel; chickaree)? |--o T. hudsonicus (punaorava) | |-- T. h. hudsonicus (punaorava) | `-- T. h. grahamensis (grahamvuorenpunaorava) |-- T. douglasii (douglas' squirrel) `-- T. mearnsi (mearn's squirrel)
Reference(s):
- McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631 - Nowak, R. M., 1991: Walker's Mammals of the World; Part 1.
–The Johns Hopkins University Press, Baltimore and London, 1991, xlviii-642-lxiii - Nowak, R. M., 1991: Walker's mammals of the World; Part 2.
–The Johns Hopkins University Press, Baltimore and London, 1991, xii-643-1629