The body consists of a central disk from which five arms radiate outward. The arms are not sharply marked off from the central disk. Sea stars have no designated head, and the mouth is in the center of the disk on the lower side of the sea star. The Asterias rubens may be a variety of colors including red, purple, and orange. Asterias rubens are measured anywhere from 5mm in armlength diameter to 150mm in diameter. (Bullough 1950)
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