Also known as Doctorfishes, Lancetfishes, Thorntails, Thorntail Fish, Achilles Surgeonfish, Orange-spot Surgeonfish, Red-spot Surgeonfish, Red-tailed Surgeon.
Found singly or in groups over clear water sand bottoms close to surge zones of reefs.
Very aggresive and territorial.
They feed on algae.
Length - 20cm
Depth - 0-4m
Widespread Central Pacific
Surgeonfish have a blade like spine in the tail that points outwards when bent, unicorns have two hook-like plates along the tail, these are used for defence and are as sharp as a surgeons scalpel, hence the name "Surgeonfish".
Some species are venomous.