Two mammal families was collected near Brazilina borders, and maybe collected also in country. Both was collected in NE Argentina, near Brazilian border at western bank of Uruguay river, in Rio Grande do Sul state. Lagostomus maximus Desmarest, 1817, belong to rodent family Chinchilidae, a family absent in Brazil, and also occur in Bolivia and Paraguay; Chacodelphys formosa Shamel, 1930, is a marsupial from Didelphidae family, and is a endemic genus for Argentina.
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| ARGENTINAN RANGE OF LAGOSTOMUS (BLUE DOTS, ECOREGISTROS) AND CHACODELPHYS (PINK DOTS, TETA & PARDINAS, 2007, SEE) |