A dual biotic nature: What can history tell us about the biogeographical regionalization of Argentina?

The biogeographic regionalizations of Argentina of different authors, from Wallace (1876) to Arana et al. (2021), are compared and their conceptual frameworks discussed. The existence of a transition zone between the Neotropical and Andean regions is especially analyzed. Currently, six provinces (Yungas, Parana, Araucaria Forest, Chaco, Esteros del Iberá and Pampean) are assigned to the Neotropical region, six provinces (Patagonian, Maule, Valdivian Forest, Magellanic Forest, Magellanic Moorland and Falkland Islands) to the Andean region, and four provinces (Puna, Monte, Cuyan High Andean and Comechingones) to the South American Transition Zone.