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Eumetazoa (metazoans)
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Class Hydrozoa
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Order Anthoathecata
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Family Oceanidae
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Genus Cordylophora
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Genus Corydendrium
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Genus Corystolona
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Genus Merona
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Genus Oceania
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Genus Pachycordyle
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Genus Similomerona
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Genus Tubiclava
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Genus Turritopsis
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Genus Turritopsoides
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