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 | Platyhelminthes Minot, 1876
– flatworms, plathelminthes, platodes, platelminte |
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| Subphylum | Rhabditophora Ehlers, 1985
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| Infraphylum | Trepaxonemata
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| Superclass | Euneoophora
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| Class | Rhabdocoela
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| Order | Dalytyphloplanida
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| Family | Dalyelliidae Graff, 1905
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| Genus | Castrella Fuhrmann, 1900
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| Subgenus | Castrella (Castrella) Luther, 1955 |
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Direct Children: |
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| Species | Castrella alba Luther, 1955
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| Species | Castrella cylindrica Riedel, 1932
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| Species | Castrella graffi Hayes, 1945
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| Species | Castrella groenlandica Riedel, 1932
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| Species | Castrella pinguis (Silliman, 1884)
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| Species | Castrella truncata (Abildgaard, 1789)
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| Species | Castrella vernalis Beklemischev, 1921
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