Nephelomys caracolus (Thomas, 1914)

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 : 46

Nephelomys caracolus

Karyotype: 2n = 66 and FN = 90. Autosomal complement: two medium subtelocentric pairs, 11 metacentric and submetacentric pairs medium to small decreasing in size, and 19 acrocentric pairs medium to small decreasing in size. Sex chromosomes: X, a medium metacentric; Y, a small subtelocentric ( Kiblisky 1969, pp. 1339, Fig. 1 ; Aguilera et al. 1995). C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of all autosomes, some acrocentric pairs presented a lightly stained C-band on distal regions of its long arm. The X chromosome presented a conspicuous pericentromeric heterochromatic block. The Y chromosome was totally heterochromatic. G-banding was also performed ( Aguilera et al. 1995).

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.