The princess parrotfish (Scarus taeniopterus) is a species of marine ray-finned fish, a parrotfish, in the family Scaridae. It is typically 20 to 25 centimetres (7.9 to 9.8 in) long, found in the Caribbean, South Florida, the Bahamas, and Bermuda. Its behavior, similar to other parrotfishes, is to swim about the reef and sandy patches during the day, at depths between 3 and 25 metres (9.8 and 82.0 ft), scraping algae on which it feeds.
The diet of Scarus taeniopterus consists of algae and they are known primarily to be herbivores. By consuming epilithic algae, the fish are able to open space for young coral settlement and growth. They play a significant role in bringing coral reefs to recovery from major disturbances. Their distinct teeth which are fused together with their beak jaws allow them to crush and grind food. Climate change has increasingly started to alter the availability of food for adult populations of Scaridae, primarily in the Caribbean region. Climate change alters ocean currents which can potentially result in the reduction of food.