Oligoryzomys messorius (Thomas, 1901)

Moreira, Camila Do Nascimento, Ventura, Karen, Percequillo, Alexandre Reis & Yonenaga-Yassuda, Yatiyo, 2020, A review on the cytogenetics of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae), with the description of new karyotypes, Zootaxa 4876 (1), pp. 1-111 : 74

Oligoryzomys messorius

Karyotype: 2n = 66 and FN = 74. Autosomal complement: five metacentric and submetacentric pairs medium to small decreasing in size, and 27 acrocentric pairs (one large and the remaining medium to small decreasing in size). Sex chromosomes: X, a medium acrocentric; Y, a small acrocentric. C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of all autosomes, with the exception of the large acrocentric pair. The X chromosome presented pericentromeric heterochromatic blocks. The Y chromosome was entirely heterochromatic. Multiple NORs, were localized at the telomeric regions of the short arms of two autosomes pairs ( Andrades-Miranda et al. 2001a, pp. 1084, Fig. 2C ).

Figures

FIGURE 2. Distribution of diploid and fundamental number of karyotyped specimens of genus Cerradomys. (□) C. akroai; (■) C. goytaca; (ê) C. langguthi; (r) C. maracajuensis; (▲) C. marinhus; (○) C. scotti; (☆) C. subflavus; (l) C. vivoi.