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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Platyhelminthes (flatworms)
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Class Trematoda
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Order Polyopisthocotylea
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Family Allomicrocotylidae
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Family Allopyragraphoridae
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Family Anchorophoridae
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Family Aviellidae
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Family Axinidae
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Family Cemocotylidae
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Family Chimaericolidae
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Family Dactylocotylidae
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Family Diclidophoridae
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Family Diclybothriidae
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Family Discocotylidae
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Family Gastrocotylidae
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Family Heteraxinidae
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Family Hexabothriidae
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Family Hexostomatidae
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Family Macrovalvitrematidae
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Family Mazocraeidae
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Family Megalonchidae
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Family Microcotylidae
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Family Octolabeidae
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Family Polystomatidae
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Family Protomicrocotylidae
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Family Pterinotrematidae
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Family Pyragraphoridae
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Family Sphyranuridae
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