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Geographic barriers and elevational gradients have long been recognized as important in species diversification. Here, we illustrate an example where both mechanisms have shaped the genetic structure of the Neotropical rainfrog,  Pristimantis ornatissimus , which has also resulted in speciation. This species was thought to be a single evolutionary lineage distributed throughout the Ecuadorian Chocó and the adjacent foothills of the Andes. Based on recent sampling of  P .  ornatissimus  sensu lato, we provide molecular and morphological evidence that support the validity of a new species, which we name  Pristimantis ecuadorensis  sp. nov. The sister species are elevational replacements of each other; the distribution of  Pristimantis ornatissimus  sensu stricto is limited to the Ecuadorian Chocó ecoregion (< 1100 m), whereas the new species has only been found at Andean localities between 1450–1480 m. Given the results of the Multiple Matrix Regression with Randomization analysis, the genetic difference between  P .  ecuadorensis  and  P .  ornatissimus  is not explained by geographic distance nor environment, although environmental variables at a finer scale need to be tested. Therefore this speciation event might be the byproduct of stochastic historic extinction of connected populations or biogeographic events caused by barriers to dispersal such as rivers. Within  P .  ornatissimus  sensu stricto, morphological patterns and genetic structure seem to be related to geographic isolation (e.g., rivers). Finally, we provide an updated phylogeny for the genus, including the new species, as well as other Ecuadorian  Pristimantis .

Diversification of the rainfrog Pristimantis ornatissimus in the lowlands and Andean foothills of Ecuador