Louvar

The louvar or luvar (Luvarus imperialis) is a species of marine ray-finned fish, it is the only extant species in the genus Luvarus and family Luvaridae. This taxon is classified within the suborder Acanthuroidei, which includes the surgeonfish, of the order Acanthuriformes, and is the only pelagic species of this order. The juvenile form has a pair of spines near the base of the tail, like the surgeonfish, though they are lost in the adult.