Nicholsina usta

Nicholsina usta (Valenciennes in Cuvier and Valenciennes, 1840) is a species of actinopterygii belonging to the family Scaridae (order Perciformes).

Common name. In English this species is commonly known as the emerald parrotfish.

Taxonomy. The scientific name Nicholsina usta (Valenciennes in Cuvier and Valenciennes, 1840) places this species within the actinopterygii lineage, among the most diverse vertebrates on Earth.

Description & ecology. As a member of Perciformes, Nicholsina usta exhibits the group's characteristic adaptations: They are spiny-rayed fishes with two dorsal fins and great ecological diversity across reefs, open water, and fresh water. Its biology reflects the demands of its particular habitat and life history within the family Scaridae.

Distribution. The species occurs within the natural range of its lineage; precise localities and depth preferences are documented in the taxonomic literature for Scaridae.

Human relevance. Like many fishes, it may be of interest to fisheries, aquaculture, the aquarium trade, or conservation, depending on its abundance and distribution.