also known as the longspine squirrelfish, is a species of marine fish belonging to the family Holocentridae. It is found in the tropical waters of the western Atlantic Ocean, ranging from the coast of Florida down to Brazil, including the Caribbean Sea and the Gulf of Mexico.

The Largescale Squirrelfish can grow up to 30 cm (12 inches) in length and has a cylindrical, elongated body with a pointed snout and large eyes. The body is covered with rough scales, and the fish has long dorsal spines that can be extended for defense. The fish is reddish-brown in color, with a silver-white underbelly and a distinctive pattern of vertical lines along its sides.

Like other squirrelfish species, the Largescale Squirrelfish is primarily nocturnal, and during the day, it hides in crevices and caves among coral reefs. At night, it comes out to feed on small fish and crustaceans. It is also known to have a social hierarchy, with larger individuals dominating smaller ones.

The Largescale Squirrelfish is an important species in the tropical marine aquarium trade due to its striking appearance and hardiness in captivity. It is often kept in large reef aquariums with other fish species and can be fed a variety of meaty foods, including frozen shrimp and krill. However, it can be aggressive towards other fish, especially if they are of a similar size and shape.

In terms of conservation status, the Largescale Squirrelfish is not considered to be a threatened species. However, like many coral reef fish, it is vulnerable to overfishing and habitat destruction. Populations of the fish have been impacted by the use of destructive fishing practices, such as blast fishing and cyanide fishing. Additionally, the degradation of coral reefs due to climate change, pollution, and coastal development has further threatened the habitat of the Largescale Squirrelfish and other reef species.