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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 Accacoeliidae
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Family Albulatrematidae
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Family Aphanhysteridae
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Family Areobiotrematidae
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Family Arnolidae
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Family Azygiidae
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Family Bathycotylidae
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Family Bivesiculidae
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Family Cylindrorchiidae
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Family Dictysarcidae
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Family Didymozoidae
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Family Halipegidae
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Family Hemiuridae
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Family Hirudinellidae
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Family Lampritrematidae
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Family Lobatovitelliovariidae
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Family Mabiaramidae
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Family Oesophagicolidae
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Family Prosogonotrematidae
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Family Ptychogonimidae
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Family Sclerodistomidae
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Family Syncoeliidae
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Family Tetrasteridae
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