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 | Bryozoa
– moss animals |
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| Class | Gymnolaemata
– marine bryozoans, tubular bryozoans, bryozoaires marins, bryozoaires tubulés |
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| Subclass | Eurystomata
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| Order | Ctenostomata Busk, 1852
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| Suborder | Carnosa Gray, 1841
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| Superfamily | Paludicelloidea
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| Family | Arachnidiidae Hincks, 1880
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| Genus | Arachnidium Hincks, 1859 |
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Direct Children: |
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| Species | Arachnidium clavatum Hincks, 1877
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| Species | Arachnidium fibrosum Hincks, 1880
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| Species | Arachnidium hippothoides Hincks, 1862
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| Species | Arachnidium simplex Hincks, 1880
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