Claim: Stegastes adustus, the dusky damselfish or scarlet-backed damoiselle, is a damselfish which feeds on algae, plants, and detritus.
Evidence: Stegastes adustus, the dusky damselfish or scarlet-backed demoiselle, is a damselfish of the family Pomacentridae found at one- to three-meter depths on surging and wavy coral reefs in the Caribbean Sea, the tropical waters of the western Atlantic Ocean, and the Gulf of Mexico. Adults feed on algae, plants, and detritus.