Zachaenus parvulus (common names: Girard's frog, Rio bug-eyed frog) is a species of frog in the family Cycloramphidae. It is endemic to southeastern Brazil and is known from the eastern São Paulo, Rio de Janeiro, and Espírito Santo states. Its natural habitats primary and secondary forests where it lives in the leaf-litter on the forest floor. It is a common species. Habitat loss might pose some threat to it. References parvulus Endemic fauna of Brazil Amphibians of Brazil Taxa named by Charles Frédéric Girard Amphibians described in 1853 Taxonomy articles created by Polbot