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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 Azygiida
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Family Didymozoidae
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Genus Adenodidymocystis
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Genus Annulocystis
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Genus Atalostrophion
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Genus Coeliodidymocystis
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Genus Coeliotrema
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Genus Colocyntotrema
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Genus Dermatodidymocystis
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Genus Didymocylindrus
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Genus Didymocystis
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Genus Didymoproblema
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Genus Gonapodasmius
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Genus Lobatozoum
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Genus Nematobothrioides
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Genus Nematobothrium
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Genus Neodiplotrema
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Genus Neonematobothrioides
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Genus Neounitubulotestis
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Genus Oesophagocystis
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Genus Opepherotrema
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Genus Orbitonematobothrium
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Genus Ovarionematobothrium
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Genus Phacelotrema
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Genus Platocystis
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Genus Reniforma
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Genus Unitubulotestis
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Genus Univitellannulocystis
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Genus Univitellodidymocystis
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