Rio Big-tooth Frog
Megaelosia goeldii
- Least concern
- Card rarity: Common
- Amphibians

Megaelosia goeldii, also known as the Rio big-tooth frog, is a species of frog in the family Hylodidae. It is the only member of the genus Megaelosia. It is endemic to Southeast Brazil and occurs in São Paulo and Rio de Janeiro states. It is named after Émil Goeldi, a Swiss zoologist who worked in Brazil.
Classification
- Class
- Amphibia
- Order
- Anura
- Family
- Hylodidae
- Genus
- Megaelosia