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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 | Gastrotricha Metschnikoff, 1865
– gastrotriches, gastrótrico, gastrotrichs |
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| Order | Macrodasyida Remane, 1924
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| Family | Thaumastodermatidae Remane, 1929
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| Genus | Ptychostomella Remane, 1926 |
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Direct Children: |
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| Species | Ptychostomella brachycephala (Levi, 1954)
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| Species | Ptychostomella helana Roszczak, 1939
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| Species | Ptychostomella higginsi Clausen, 2004
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| Species | Ptychostomella lepidota Clausen, 2000
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| Species | Ptychostomella mediterranea Remane, 1927
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| Species | Ptychostomella ommatophora Remane, 1927
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| Species | Ptychostomella pectinata Remane, 1926
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| Species | Ptychostomella tyrrhenica Hummon, Todaro and Tongiorgi, 1993
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