Abstract
Brachycephalus are miniaturized amphibians whose body length is < 20 mm, which occur in the Atlantic Forest and range in distribution from the state of Bahia to the state of Santa Catarina. Most populations of Brachycephalus occur at 400 meters above sea level and this lower altitudinal limit induces allopatry between populations and species. A remarkable phenotypic trait of Brachycepha…