Chaetodontoplus poliourus, the greytail angelfish, is a species of marine fish belonging to the family Pomacanthidae.

It is similar to its sister species Chaetodontoplus mesoleucus, and the two were considered as being the same species for a long time.

However, they can be readily distinguished by the color of their tails: C. poliurus has a grey tail, whereas C. mesoleucus has a yellow tail.

[1] The Greytail Angelfish can be found in inshore reefs and lagoons of the western Pacific, from Indonesia to Palau and Solomon Islands.

[2] It's rare in the aquarium trade, but highly sought after,[3] and listed as Least Concern by the IUCN Red List.