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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Class Adenophorea
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Subclass Chromadoria
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Order Desmodorida
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Family Selachinematidae
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Genus Synonchium
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Species Synonchium depressum
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Species Synonchium obtusum
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Species Synonchium pacificum
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