Cystignathus parvulus Girard, 1853 Oocormus microps Boulenger, 1905 Ceratophrys fusciventris Lutz, 1926 Leptodactylus parvulus (Girard, 1853) 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.

[2] Its natural habitats primary and secondary forests where it lives in the leaf-litter on the forest floor.

Habitat loss might pose some threat to it.

This Hyloidea-related article is a stub.