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DescriptionA feather-star with five pairs of feathery arms, 5-10 cm in length. The species is secured to the substratum by movable, claw-like cirri, up to about 25, on the undersurface of the disc. The animal is thus able to crawl, often quite swiftly. The colour of Antedon bifida is varied, red, pink, orange or yellow, often mottled or banded.Antedon bifida may be confused with another feather-star species Antedon petasus which has a more northerly distribution around the British Isles. Antedon petasus is larger and has 50 or so short cirri on the undersurface of the disc.