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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 Crinoidea
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Order Comatulida
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Family Antedonidae
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Genus Hathrometra
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Species Hathrometra prolixa
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Species Hathrometra sarsii
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Species Hathrometra tenella
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