Rhinecanthus is a triggerfish

Triggerfish

Triggerfishes are about 40 species of often brightly colored fishes of the family Balistidae. Often marked by lines and spots, they inhabit tropical and subtropical oceans throughout the world, with the greatest species richness in the Indo-Pacific...

 genus from the Indo-Pacific

Indo-Pacific

The Indo-Pacific is a biogeographic region of the Earth's seas, comprising the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia...

. They are found at reefs, and all except R. abyssus are restricted to relatively shallow depths. They are among the smallest members of the family, with no species surpassing 30 centimetres (11.8 in) in length. They are primarily brownish, greyish and white, and have strongly contrasingly patterns in yellow, orange, blue or black. Adults of all have a relatively dark line (in most species intermixed with blue) that extends from the forehead down through the eye to the pectoral fin.

Species

The genus includes the following species:

• Rhinecanthus abyssus Matsuura & Shiobara, 1989
• Rhinecanthus aculeatus (Linnaeus, 1758) , Blackbar triggerfish
• Rhinecanthus assasi (Forsskål, 1775), Picasso triggerfish
• Rhinecanthus cinereus (Bonnaterre, 1788)
• Rhinecanthus lunula Randall & Steene, 1983, Halfmoon picassofish
• Rhinecanthus rectangulus (Bloch & Schneider, 1801), Wedge-tail triggerfish
• Rhinecanthus verrucosus
  Rhinecanthus verrucosus
  Rhinecanthus verrucosus is a Triggerfish from the Indo-West Pacific. It occasionally makes its way into the aquarium trade. It grows to a size of 23 cm in length....
  
  (Linnaeus, 1758), Blackbelly triggerfish