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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Deuterostomia (deuterostomes)
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Echinodermata (sea stars, sea urchins, sea cucumbers, and relatives)
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Class Echinoidea
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Order Spatangoida
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Family Aeropsidae
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Family Asterostomatidae
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Family Brissidae
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Family Hemiasteridae
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Family Loveniidae
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Family Neolampadidae
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Family Pourtalesiidae
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Family Schizasteridae
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Family Spatangidae
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Family Urechinidae
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