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Karyotypic polymorphism of five taxa of the rodent genus Rhipidomys from the Brazilian Amazon and Cerrado biomes was analysed. Rhipidomys nitela Thomas, 1901 from Amazon has 2n = 48, FN = 68. The other species, all have 2n = 44, but can be separated into two groups, one with high FNs (76, 80) and the other with low FNs (48, 52). Two cytotypes of R. mastacalis (Lund, 1840) with high FNs were trapped...
We analysed karyotypes of five taxa of the rodent genera Oecomys and Nectomys, trapped in 14 localities in an area ranging from 8° to 29°S on Brazilian territory. Oecomys cf. concolor, collected in the Amazon and in two localities of the Cerrado biome, showed a 2n = 60 karyotype constituted by a pair of large subtelocentric chromosomes, a small metacentric pair and 27 acrocentric pairs. The X chromosome...
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