Zachaenus is a genus of frogs in the family Cycloramphidae. There are two species that both are endemic to southeastern Brazil. Common name bug-eyed frogs has been coined for the genus.

Ecology Zachaenus are leaf-litter inhabitants of the Atlantic rainforest of southeastern Brazil.

Species The genus contains the following species: Zachaenus carvalhoi Izecksohn, 1983 Zachaenus parvulus (Girard, 1853)

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