Subspecies and Distribution. C. f. frater Thomas, 1902 — S Bolivia (E Potosi Department). C. f. barbarous Thomas, 1921 — NW Argentina (S Jujuy and adjacent Salta provinces). C. f. budini Thomas, 1913 — NW Argentina (high altitudes in Jujuy and WC Salta provinces). C. f. mordosus Thomas, 1926 — S Bolivia (S Tarija); possibly adjacent N Argentina (Jujuy Province). C. f. sylvanus Thomas, 1919 — NW Argentina (base of Andes in E Jujuy and W Salta provinces). in Ctenomyidae

Subspecies and Distribution. C. f. frater Thomas, 1902 — S Bolivia (E Potosi Department). C. f. barbarous Thomas, 1921 — NW Argentina (S Jujuy and adjacent Salta provinces). C. f. budini Thomas, 1913 — NW Argentina (high altitudes in Jujuy and WC Salta provinces). C. f. mordosus Thomas, 1926 — S Bolivia (S Tarija); possibly adjacent N Argentina (Jujuy Province). C. f. sylvanus Thomas, 1919 — NW Argentina (base of Andes in E Jujuy and W Salta provinces).Published as part of Don E. Wilson, Thomas E. Lacher, Jr & Russell A. Mittermeier, 2016, Ctenomyidae, pp. 498-534 in Handbook of the Mammals of the World – Volume 6 Lagomorphs and Rodents I, Barcelona :Lynx Edicions on page 515, DOI: 10.5281/zenodo.658817