Zygodontomys brevicauda (Allen & Chapman, 1893)

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 : 83

Zygodontomys brevicauda (= Z. b. cherriei)

The karyotypes of 2n = 82 and 2n = 84 were described by Gardner & Patton (1976), and Voss (1991), but in both cases the authors mention the karyotype without description or illustration of the chromosomes. Bonvicino et al. (2003, pp. 124, Fig. 2B ) described a karyotype of 2n = 82 and FN = 116. Autosomal complement: 18 biarmed pairs (two large and 16 medium to small decreasing in size), and 22 medium to small acrocentric pairs decreasing in size. Sex chromosomes: X, a large submetacentric; Y, a small metacentric. These variation in diploid number occurs sympatrically on specimens collected in Zulia, state of Venezuela ( Table 11, Fig. 22 ).

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.

FIGURE 22. Distribution of diploid and fundamental number of karyotyped specimens of genus Zygodontomys. (l) Z. b. brevicauda; (■) Z. b. cherriei; (○) Z. b. microtinus; (ê) Zygodontomys sp. 1; (□) Zygodontomys sp. 2.