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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 Gorgoderidae
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Genus Probolitrema
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Species Probolitrema californiense
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Species Probolitrema richardii
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