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Seastars are marine invertebrates belonging to the class Asteroidea. They are characterized by their radial symmetry, typically having five arms that radiate from a central disc. Seastars can be found in a variety of colors and sizes, with some species growing up to several feet in diameter. They are known for their unique method of feeding, using tube feet and a water vascular system to pry open shellfish and other prey. Seastars play an important role in marine ecosystems as predators and scavengers, helping to maintain a balance in the underwater food chain.