Map indicating a collection sites of Akodon montensis in the province of Misiones, Argentina analyzed in this work: A and B Iguazú C Parque Provincial Urugua-í D Puerto Esperanza E San Ignacio F Candelaria b different localities in Brazil and Argentina where A. montensis has been studied previously at cytogenetic level; Brazil: 1 Boracéia 2 Sumidouro 3 Nova Friburgo 4 Teresópolis 5 Petrópolis 6 S. J. do Barreiro 7 Taubaté 8 Caçapava 9 Salesópolis 10 Guararema 11 Itapetininga 12 Iguape 13 Quatro Barras 14 Tres barras; Argentina: 15 Misiones, Urugua-í.