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Eumetazoa (metazoans)
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Class Hydrozoa
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Order Anthoathecata
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Family Acaulidae
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Family Asyncorynidae
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Family Australomedusidae
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Family Boeromedusidae
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Family Boreohydridae
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Family Bougainvilliidae
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Family Bythotiaridae
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Family Candelabridae
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Family Capitata
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Family Cladocorynidae
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Family Cladonematidae
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Family Cladosarsiidae
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Family Clathrozoellidae
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Family Corymorphidae
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Family Corynidae
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Family Cytaeididae
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Family Eleutheriidae
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Family Eudendriidae
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Family Euphysidae
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Family Halocorynidae
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Family Hydractiniidae
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Family Hydrichthyidae
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Family Hydridae
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Family Hydrocorynidae
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Family Margelopsidae
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Family Milleporidae
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Family Moerisiidae
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Family Niobiidae
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Family Not assigned
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Family Oceanidae
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Family Pachycordylidae
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Family Pandeidae
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Family Paracorynidae
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Family Pennariidae
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Family Polyorchidae
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Family Porpitidae
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Family Proboscidactylidae
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Family Protiaridae
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Family Protohydridae
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Family Ptilocodiidae
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Family Rathkeidae
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Family Rhysiidae
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Family Rosalindidae
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Family Russelliidae
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Family Solanderiidae
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Family Sphaerocorynidae
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Family Stylasteridae
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Family Teissieridae
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Family Trichydridae
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Family Tricyclusidae
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Family Tubidendridae
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Family Tubulariidae
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Family Zancleidae
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Family Zancleopsidae
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