Oryzomys palustris (Harlan, 1837)

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 : 77

Oryzomys palustris

Karyotype: 2n = 56 and FN = 56. Autosomal complement: one small metacentric pair, and 26 acrocentric pairs (one very large and the remaining large to small decreasing in size). Sex chromosomes: X chromosome presented two different morphologies, a large acrocentric, and a large subtelocentric; Y, a small acrocentric ( Gardner & Patton 1976; Benson & Gehlbach 1979, pp. 227, Fig. 1B ; Haiduk et al. 1979). G-banding karyotype was performed by Haiduk et al. (1979) and Baker et al. (1983).

The karyotypes of O. couesi and O. palustris were very similar, but O. palustris exhibits a distinctly large acrocentric chromosome that was not present in O. couesi .

Figures

FIGURE 1. Collection localities of Oryzomyini species analyzed in this work. (1) Claúdia, Mato Grosso state; (2) and (3) Rio Japurá, Amazonas state; (4) and (5) Rio Içá, Amazonas state.