Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Bilateria
– triploblasts |
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| Infrakingdom | Protostomia
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| Superphylum | Spiralia
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| Phylum | Sipuncula
– peanut worms, shore worms, sipunculan worms, sipúnculo, shore worms, sipunculiens, sipunculans |
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| Class | Phascolosomatidea E. Cutler and Gibbs, 1985
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| Order | Aspidosiphoniformes E. Cutler and Gibbs, 1985
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| Family | Aspidosiphonidae Baird, 1868
– aspidosiphonids |
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| Genus | Lithacrosiphon Shipley, 1902
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| Species | Lithacrosiphon cristatus (Sluiter, 1902)
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| Subspecies | Lithacrosiphon cristatus cristatus (Sluiter, 1902) |
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