The Maroon clownfish, the spine-cheeked clownfish, or the maroon anemonefish, Premnas biaculeatus, is a species of clownfish that is found in the Indo-Pacific from western Indonesia to Taiwan and the Great Barrier Reef. They can grow up to be about 17 cm (6. 7 in), and as they grow, they become more aggressive towards other clownfish. It is the only member of the genus Premnas, although it has been suggested that the taxon epigrammata from Sumatra should be recognized as a distinct species, Premnas epigrammata (Fowler, 1904).
The stripes across the body are normally white, but they are yellow in the taxon epigrammata. The female is usually larger than the male and dark red or maroon, and the male smaller and a bright red.