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Echinoderms
There are 5 related classes in the phylum Echinodermata (the Latin name means "spiny-skinned"). Sea star or starfish (Asteroidea) Brittle stars, basket stars, serpent stars (Ophiuroidea) Sea urchins, heart urchins and sanddollars (Echinoidea) Holothurians or sea cucumbers (Holothuroidea) Feather stars and sea lilies (Crinoidea). This site describes their biology and diversity with numerous photos....
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