Chaetodontoplus meridithii has a black body with a bluish-grey to blue face marked with yellow spots.

[2] Chaetodontoplus meridithii is found at depths of 10 to 50 metres (33 to 164 ft)[1] on coastal reefs and open areas which have substrates of rock, coral, sponge, or outcrops of sea whips.

The adults are mainly encountered in pairs but sometimes they are solitary, generally in deeper waters at depths greater than 30 metres (98 ft).

[4] Chaetodontoplus meridithii was first formally described in 1989 by the Netherlands-born Australian underwater photographer, taxonomist, marine biologist Rudie Hermann Kuiter with the type locality given as the Pilot Station in Port Jackson.

[5] The specific name honours the collector of the type, the aquarist and dive instructor John G.