Heliastes immaculatus Ogilby, 1885 The immaculate damselfish (Mecaenichthys immaculatus), also known as the green puller, is a species of ray-finned fish, it is the only species in the monotypic genus Mecaenichthys, classified in the subfamily Pomacentrinae of the family Pomacentridae.

The immaculate damselfish is distinguished from other species of damselfishes by having a pointed head with large eyes and bluish-silver coloured body with a thin blue iridescent margin around the caudal fin.

The juveniles are orange in colour with bright blue iridescent stripes.

[5] The adults are found on rocky or weedy inshore reefs and form pairs during breeding.

Their eggs are demersal and adhere to the substrate where they are guarded and aerated by the male.