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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 | Gnathostomulida Sterrer, 1972
– gnatostomulídeo, gnathostomulids |
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| Order | Bursovaginoidea Sterrer, 1972
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| Suborder | Scleroperalia Sterrer, 1972 |
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Direct Children: |
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| Family | Agnathiellidae Sterrer, 1972
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| Family | Clausognathiidae Sterrer, 1992
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| Family | Gnathostomariidae Sterrer, 1972
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| Family | Gnathostomulidae Sterrer, 1972
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| Family | Mesognathariidae Sterrer, 1972
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| Family | Onychognathiidae Sterrer, 1972
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| Family | Paucidentulidae Sterrer, 1998
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| Family | Problognathiidae Sterrer and Farris, 1975
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| Family | Rastrognathiidae Kristensen and Nørrevang, 1977
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