It is hard to confuse the Maroon Clownfish Premnas biaculeatus with any of the other clownfish species. It has a wide distribution across the Indo-west Pacific into the Indo-Australian Archipelago, but it is a one-of-a-kind specimen in a genus all its own.
It can be differentiated from all the other clownfish by a uniform red color and spines sticking out from its cheeks. Due to these cheek spines, in 1790 Bloch originally described it as Chaetodon biaculeatus. Chaetodon are actually butterflyfish and those fish do have these spines, while this fish is a clownfish. But because of its spines it is also known by the common names Spinecheek Anemonefish and Spine-Cheek Clownfish, as well as the Maroon Anemonefish.