Holochilus brasiliensis (Desmarest, 1819)

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 : 18

Holochilus brasiliensis

Karyotype: 2n = 40 and FN = 56. Autosomal complement: eight biarmed pairs large to small decreasing in size, one small metacentric pair, and 10 small acrocentric pairs. Sex chromosomes: X, a medium acrocentric; Y, a small acrocentric. C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of eight acrocentric pairs, and two biarmed pairs. The X chromosome presented constitutive heterochromatin on the centromeric region and on the short arm, while the Y chromosome presented a distal half heterochromatic region. G-banding was also performed ( Freitas et al. 1983, pp. 16, Fig. 4 ).

Figures

FIGURE 4. Karyotype of Euryoryzomys sp., male with 2n = 58 and FN = 92. (A) Conventional staining (JAP 228); (B) C-banding (JAP 228); (C) G-banding (JAP 228); (D) Metaphase plate after fluorescent in situ hybridization with telomeric probe (left) and DAPI staining (right) (JAP 228), arrows indicate the hybridization of interstitial telomeric sequence.