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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 Plagiorchiida
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Family Opecoelidae
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Genus Alloanomalotrema
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Genus Allopodocotyle
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Genus Allostenoperca
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Genus Anomalotrema
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Genus Apertile
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Genus Apopodocotyle
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Genus Cainocreadium
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Genus Crowcrocaecum
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Genus Dactylostomum
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Genus Decemtestis
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Genus Eurycreadium
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Genus Genitocotyle
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Genus Hamacreadium
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Genus Helicometra
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Genus Helicometrina
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Genus Manteriella
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Genus Neohelicometra
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Genus Neonotoporus
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Genus Neopecoelus
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Genus Neopodocotyloides
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Genus Nezpercella
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Genus Nicolla
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Genus Opecoelina
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Genus Opecoeloides
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Genus Opecoelus
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Genus Opegaster
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Genus Opercoelus
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Genus Ozaki
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Genus Pellamyzon
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Genus Plagioporus
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Genus Podocotyle
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Genus Pseudopecoeloides
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Genus Pseudopecoelus
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Genus Stenoperca
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