The Mundo Novo tree frog (Boana marginata) is a species of frog in the family Hylidae. It is endemic to south-eastern Brazil where it is known from the easternmost Rio Grande do Sul and adjacent southeastern Santa Catarina.[1] Its natural habitats are forested mountain slopes near streams with clear running water. The eggs are deposited on vegetation hanging into the water. It is a common species although habitat loss and water pollution are threats.