Appearance
The characteristic that defines this genus is the spine on the cheek. The color of the body and bars varies according to sex and geographic location. Despite the common name of Maroon clownfish, only some females have a maroon body color, with a range of color to dark brown.Juveniles and males are bright red-orange. The fish has three body bars which may be white, grey or yellow. Where the female bars are grey, they can be "switched" rapidly to white if fish is provoked.
The sized based dominance hierarchy means in any group of anemonefish the female is always larger than the male. There is a significant difference in size for this species with females being one of the largest anemonefish, growing up to 17 centimetres while males are much smaller, usually being 6–7 centimetres.
Naming
There are no similar species because the cheek spine is distinctive of the genus and presently all geographic variations of the fish are considered to be the one species. Genetic analysis has shown that it is closely related to ''A. percula'' and ''A. latezonatus''.
Distribution
''P. biaculeatus'' is found in the Malay Archipelago and Western Pacific Ocean north of the Great Barrier Reef.References:
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