Nectomys palmipes (= N. p. palmipes (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 : 39

Nectomys palmipes (= N. p. palmipes )

Karyotype: 2n = 16 and FN = 26. Autosomal complement: three metacentric pairs (one distinctly large, one large, and one small), one large submetacentric pair, two subtelocentric pairs (one medium, and one small), and one large acrocentric pair. Sex chromosomes: X, a medium subtelocentric; Y, a small acrocentric. An autosomal polymorphism involving three chromosomal pairs (one distinctly large metacentric, one large acrocentric, and one large submetacentric) resulting in a diploid number 17 and fundamental number of 25, 28 and 29 were reported. These variation in diploid and fundamental number occurs in different localities of norther Venezuela ( Table 7, Fig. 11 ). C- and G-banding were also performed by the authors. The karyotype of N. palmipes exhibited the lowest diploid number of the tribe Oryzomyini and, so far, was described only by Barros et al. (1992, pp. 36, Fig. 3 ).

Figures

FIGURE 3. Distribution of diploid and fundamental number of karyotyped specimens of genus Euryoryzomys. (■) E. emmonsae; (□) E. lamia; (▲) E. macconnelli; (○) E. nitidus; (l) E. russatus; (r) Euryoryzomys sp. nov.; (ê) Euryoryzomys sp..

FIGURE 11. Distribution of diploid and fundamental number of karyotyped specimens of genus Nectomys. (ê) N. apicalis; (■) N. m. grandis; (l) N. palmipes; (○) N. rattus; (▲) N. squamipes.