[2] Chelmon muelleri is a long-snouted species of butterflyfish which has a silvery white background colour to the body, marked with four wide brown vertical bars and a large black ocellus at the base of the posterior dorsal fin.

It is a carnivorous species which has a diet consisting of worms, clams, tunicates, and crustaceans.

[5] Chelmon muelleri was first formally described in 1879 by the German zoologist Carl Benjamin Klunzinger (1834-1914)[6] with the type locality given as Port Denison in Queensland.

[3] The specific name honours the German physician, geographer and botanist Ferdinand von Mueller (1825-1896).

[7] Chelmon muelleri rarely appears in the aquarium trade and when it does it commands high prices.