Order Lagomorpha Author Robert S. Hoffmann text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 807 827 book chapter http://doi.org/10.5281/zenodo.7353088 1-56098-217-9 7353088 Ochotona cansus Lyon, 1907 . Smithson. Mise. Coll., 50:136 . TYPE LOCALITY: "Taocheo, Kan-su , China " [Lintan, Gannan A.D., Gansu , China ] . DISTRIBUTION: C China ( Gansu , Qinghai , Sichuan ); isolated populations in Shaanxi and Shanxi . STATUS: The Shanxi subspecies sorella , isolated in the extreme northwest of the species range, may be extinct. It is known from only a few specimens, and has not been found in over 50 years. SYNONYMS: morosa Thomas, 1912; sorella Thomas, 1908 ; stevensi Osgood, 1932 . COMMENTS: Büchner (1890) originally included this species in the quite different O. roylei , but in recent years it has usually been assigned to O. thibetana ( Allen, 1938 ; Argyropulo, 1948 ; Corbet, 1978c ; Ellerman and Morrison-Scott, 1951 ; Gureev, 1964 ; Honacki et al., 1982 ; Weston, 1982 ). Recent studies showed that cansus and thibetana are broadly sympatric, with distinct ecological niches, and morphological characters that do not intergrade ( Feng and Kao, 1974 ; Feng and Zheng, 1985 ). The latter authors, without access to holotypes , assigned the race morosa to thibetana , but it is an isolated subspecies of cansus that is sympatric with O. thibetana in the Tsing Ling Shan , Shaanxi Province (A. T. Smith et al., 1990, and references therein).