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Echinodermata

Subphylum: Eleutherozoa

Superclassis: Asterozoa

Classes: Asteroidea - †Somasteroidea Subphylum: Eleutherozoa

Superclassis: Cryptosyringida

Classes: Echinoidea - Holothuroidea - Ophiuroidea Subphylum: †Homalozoa

Classis: Stylophora Subphylum: Pelmatozoa

Classes: †Blastoidea - Crinoidea

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17y ago

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