Abstract
The family Didelphidae includes most of the New World marsupials, with 97 species distributed in 18 genera. The slender opossums, genus Marmosops, include 15 species, of which 8 can be found in Brazil. Two of these species, Marmosops paulensis and Marmosops incanus, are endemic to eastern Brazil. M. incanus is more widely distributed, being found in coastal Atlantic forests of south-eastern Brazil, but also further north into peripheral areas of the Cerrado savannas and the Caatinga scrublands. Before the present study, the northernmost record of M. incanus was from the municipality of São Gonçalo dos Campos, in the Brazilian state of Bahia. The present study provides the first records of the species from the Brazilian state of Sergipe, and extends its geographic range as far as the right bank of the São Francisco River, 320 km north and east of its previous northernmost locality in the state of Bahia. Specimens were collected from two sites in Sergipe, the Mata do Junco Wildlife, in the Atlantic Forest, and a highland forest enclave in the Caatinga at Serra da Guia, in the eastern extreme of the state.
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