Mus vulpinus Brants, 1827 (ZMB_MAM 1681)

The material consists of a well-preserved skin (Fig. 4 c), a fragmented cranium and mandible, with condylar, angular, and coronoid processes missing. Lichtenstein (1830) stated that Sellow collected the type specimen (ZMB _MAM 1681) on the banks of Rio Uruguay, not specifying the country. The label and the Generalkatalog read “ Uruguay ” as the collecting locality. Hershkovitz (1955) and Cerqueira (1975) affirm that it is not possible to restrict the type locality to any place other than the banks of Rio Uruguay, Uruguay, and western Rio Grande do Sul, Brazil . Nevertheless, taking into account the marshy habitat in which the species occurs, Cerqueira (1975) proposed restricting the type locality to Itaqui, Brazil, near the Uruguayan border, a decision subsequently followed by Gonçalves et al. (2015).