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echinoderm summary

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Learn about the species and distribution of echinoderms

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Below is the article summary. For the full article, see echinoderm.
sunflower starfish
sea star Summary
Sea star, any marine invertebrate of the class Asteroidea (phylum Echinodermata) having rays, or arms, surrounding an indistinct central disk. Despite their older common name, they are not fishes. The roughly 1,600 living species of sea stars occur in all oceans; the northern Pacific has the