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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 Echinostomida
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Family Psilostomatidae
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Genus Ribeiroia
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Species Ribeiroia marini
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Species Ribeiroia thomasi
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