John Brown
Gymnocrotaphus curvidens
- Least concern
- Card rarity: Common
- Fish

Gymnocrotaphus is a monospecific genus of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. The only species in the genus is the Gymnocrotophus curvidens, the Janbruin, an endemic to the coasts of South Africa.
Classification
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Sparidae
- Genus
- Gymnocrotaphus