Geographical locations of individuals listed in Table 1. Vegetation formations are represented by ecoregions like Cerrado, Humid Chaco, Rainforests (including the phytogeographic regions Alto Paraná Atlantic forest + Araucaria moist forest + Serra do Mar coastal forest), Dry Forests (Mato Grosso seasonal forest + Atlantic dry forest) and Savannas (Southern cone Mesopotamian savanna + Uruguayan savanna). The star indicates the type locality of Calomys tener: Lagoa Santa in the state of Minas Gerais corresponding to the Cerrado ecoregion. This map was designed using free spatial data of QGIS (Quantum GIS Development Team, 2018), available at: http://qgis.osgeo.org.