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Luidia is a large genus of active, chiefly tropical starfishes. These echinoderms are characterized by long, slender, and somewhat flabby rays. They are also known as mud-stars, referring to their bottom-dwelling nature. As part of the echinoderm group, they are related to sea lilies and starfish.123

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4 Britannica Sources
  1. Luidia
  2. mud-star
  3. Echinosphaerites
  4. Liriope

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