Corynactis is a genus of colonial anthozoans similar in appearance to sea anemones and in body format to scleractinian stony corals. These animals are cnidarians in the family Corallimorphidae. A species thought to belong to this genus feed on the crown-of-thorns seastar Acanthaster planci and may help control the crown-of-thorns population, but these are now known as Paracorynactis hoplites.

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