Three forested dispersal corridors have been proposed within the diagonal of open/dry landscapes in South America and the relative importance of each one has been the subject of debate for forest organisms. We analysed the biogeographical history of three snake genera ( Bothrops , Philodryas , and Micrurus ) from different families (Viperidae, Dipsadidae, and Elapidae, respectively) to test the corridors' importance. We recons...