Quaternary sigmodontines (Mammalia, Rodentia) from Serra da Bodoquena, Mato Grosso do Sul, Brazil

Sigmodontine rodents are extremely diversified in the Neotropics but their fossil record remains generally poorly known, especially in Brazil. Here, we examine the assemblage of sigmodontines from the limestone cave Nossa Senhora Aparecida (21°5ʹ27.89”S 56°34ʹ28.77”W), located in Serra da Bodoquena (Mato Grosso do Sul), a karstic region in southwestern Brazil. We describe cranial and dental fragments and recognise the presence of some new species not previously recorded for the region, as <i>Bibimys</i> sp., <i>Graomys</i> cf. <i>G. chacoensis, Thalpomys lasiotis</i>, and <i>Pseudoryzomys simplex</i>. This fossil assemblage is comparable to others fossil sites in Brazil, such as those from Goiás and Rio Grande do Sul, with the predominance of species from open areas, including grasslands, and some of forested environments from Cerrado landscapes.