关键词: 甘肃仓鼠, 染色体, C - 带, Ag - NORs

Abstract: The mitotic chromosomes of Cansumys canus , from Ningshan , Shaanxi Province of China were analyzed by conventional, C-banding , and Silver-staining techniques. The species has a diploid number of 24, consists of 16 metacentrics , 4 submetacentrics , 2 subtelocetrics and 2 telocentrics. Because of no male specimens it is not determined the sex chromosomes. Centromeric C bands were found in 2 pairs of chromosomes and a large heterochromatin block in long arm of one pair of subtelocentric chromosomes. Silver-stained NORs were found on the three to four pairs of chromosomes. As the comparisons of the results with the chromosome of the species Tscherskia (Cricetulus) triton [2n = 28 , 22 t + 4 m + XY (st , m) ] and other species in the Genus Cricetulus, there are several differences among them in the diploid chromosome number and karyotypes. We suggest that Cansumys canus should be one valid species.

Key words: Cansumys canus, Chromosomes, C-banding, Ag-NORs