A class or taxonomic group that includes starfish and sea stars, marine animals with radiating arms around a central disk.
From asteroid (from Greek aster, 'star') plus the Latin taxonomic suffix -ea. The name describes their star-like shape with radiating arms.
Starfish were given the scientific class name 'Asteroidea' because they're literally shaped like stars—it's one of the few times scientific names match common names perfectly!
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