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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 Aciculata
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Family Sigalionidae
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Genus Sigalion
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Species Sigalion arenicola
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Species Sigalion mathildae
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