Amphiprion chagosensis
Amphiprion chagosensis, the Chagos anemonefish, is a marine fish belonging to the family Pomacentridae, the clownfishes and damselfishes. It is named for the Chagos Archipelago in the Indian Ocean and it is endemic to the archipelago. The original specimens were collected at Diego Garcia Atoll, Chagos Archipelago. Characteristics of anemonefish. Clownfish or anemonefish are fishes that, in the wild, form symbiotic mutualisms with sea anemones and are unaffected by the stinging tentacles of the host anemone, see . The sea anemone protects the clownfish from predators, as well as providing food through the scraps left from the anemone's  meals and occasional dead anemone tentacles. In return, the clownfish defends the anemone from its predators, and parasites. Clownfish are small-sized, , and depending on species, they are overall yellow, orange, or a reddish or blackish color, and many show white bars or patches. Within species, there may be color variations, most commonly according to distribution, but also based on sex, age and host anemone. Clownfish are found in warmer waters of the Indian and Pacific oceans and the Red Sea in sheltered reefs or in shallow lagoons. In a group of clownfish, there is a strict dominance hierarchy. The  largest and most aggressive fish is female and is found at the top. Only two clownfish, a male and a female, in a group reproduce through external fertilization. Clownfish are sequential hermaphrodites, meaning that they develop into males first, and when they mature, they become females. Description. Adults are light brown with two white bars with dark edging encircling the body. All fins are dusky brown. They have 10-11 dorsal spines, 2 anal spines, 15-17 dorsal soft rays and 13-14 anal soft rays. They reach a maximum length of . Color variations. None known. Similar species. The Chagos  anemonefish is mainly distinguished by location, with similar species mostly having a geographic separation, with "A. akindynos" being found on the Great Barrier Reef and Coral Sea and "A. allardi" in East Africa. "A. bicinctus" is found in the Red Sea but has an overlapping distribution at Chagos. "A. chagosensis" has a narrower headbar and a whiteish caudal fin. Specimens can also be distinguished by differences in predorsal scalation. Distribution and habitat. "A. chagosensis" is found only in the Chagos Archipelago. Host anemones. Little is known about the specific host anemone species with which "A. chagosensis" associates, however it has  been photographed in association with: