Prionurus laticlavius the razor surgeonfish or razor sawtail, is a species of marine ray-finned fish belonging to the family Acanthuridae, the surgeonfishes, unicornfishes and tangs.

[1] Prionurus laticlavius has the specific name, laticlavius which combines latus, meaning "wide" , with clavius, which means "bar", this is thought to be a reference to the brown or blackish stripe on the otherwise yellow body of the juveniles.

The teeth are moderately large, set closely, flattened with strongly serrated edges.

The overall colour is grey contrasting with the yellow caudal fin with a dark vertical bar through the eye and another at the back of the head.

[1] It occurs on reefs in shallow water where it lives insmall groups and feeds on algae.