Oecomys franciscorum (Pardinas, Teta, Salazar-Bravo, Myers & Galliari, 2016)

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 : 55

Oecomys franciscorum

Pardiñas et al. (2016) recognized the karyotype described by Andrade & Bonvicino (2003) for an undescribed species of Oecomys from Corumbá, Mato Grosso do Sul state of Brazil, as O. franciscorum . Karyotype: 2n = 72 and FN = 90. Autosomal complement: 10 biarmed pairs (one large and the remaining medium to small decreasing in size), and 25 acrocentric pairs large to small decreasing in size. Sex chromosomes: X, a submetacentric (the largest chromosome of the complement); Y, a medium submetacentric. One female presented heteromorphism of the short arm of the X chromosome. C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of the majority of the autosome pairs. The X chromosome presented the short arm entirely heterochromatic, plus a C-band on the distal region of its long arm. The Y chromosome presented a heterochromatic block on the distal region of the long arm. G-banding was also performed ( Andrade & Bonvicino 2003, pp. 198, Fig. 2A ).

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.