Abstract
Cytogenetic analyses were performed on representatives of four Brazilian species of Rhipidomys: R. leucodactylus from Amazonia, another species from Lagoa Santa, from the type locality of R. mastacalis, plus Rhipidomys sp. and R. cearanus from the Brazilian Atlantic forest. All four species had a diploid number of 44. The fundamental numbers (FN), however, were different: 48 in R. leucodactylus, 50 in Rhipidomys sp., and 74 in R. mastacalis. G-banding comparisons revealed that Rhipidomys sp. (FN = 50) and R. leucodactylus (FN = 48) differ by one pericentric inversion whereas Rhipidomys sp. and R. leucodactylus (FN = 74) differed by at least 7 inverted chromosomes.
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