We thank Dirección de Recursos Naturales of the Corrientes Province (Argentina) and Dirección de Fauna y Parques of the Formosa Province (Argentina) for providing collecting permits, Brigitte Marazzi for constructive comments and language review, Rodrigo Cajade for valuable suggestions and comments to this manuscript, José Augusto Ruiz García, Lucila Curi and María Teresa Sandoval for help us with the images. This work was supported by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina; and Secretaría General de Ciencia y Técnica, Universidad Nacional del Nordeste (SGCyT-UNNE), Argentina. We also wish thank to the two anonymous reviewers for their helpful comments.
Received: 29 July 2015
Revised and accepted: 27 November 2015
Published online: 28 July 2016
Editor: J. van Rooijen