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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Annelida (segmented worms)
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Class Polychaeta
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Order Not assigned
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Family Capitellidae
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Genus Mediomastus
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Species Mediomastus acutus
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Species Mediomastus ambiseta
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Species Mediomastus californiensis
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Species Mediomastus capensis
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Species Mediomastus fragilis
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