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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Deuterostomia (deuterostomes)
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Craniata (craniates)
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Genus Caspiomyzon
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Genus Entosphenus
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Genus Eudontomyzon
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Genus Geotria
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Genus Ichthyomyzon
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Genus Lampetra
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Genus Lethenteron
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Genus Mordacia
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Genus Petromyzon
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