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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 | Filospermoidea Sterrer, 1972
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| Family | Pterognathiidae Sterrer, 1972
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| Genus | Pterognathia Sterrer, 1966 |
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Direct Children: |
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| Species | Pterognathia alcicornis Sterrer, 1998
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| Species | Pterognathia atrox Sterrer, 1969
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| Species | Pterognathia crocodilus Sterrer, 1991
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| Species | Pterognathia ctenifera Sterrer, 1970
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| Species | Pterognathia hawaiiensis Sterrer, 1991
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| Species | Pterognathia meixneri Sterrer, 1969
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| Species | Pterognathia pygmaea Sterrer, 1998
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| Species | Pterognathia sica Sterrer, 2001
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| Species | Pterognathia sorex Sterrer, 1969
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| Species | Pterognathia swedmarki Sterrer, 1966
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| Species | Pterognathia ugera Sterrer, 1991
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| Species | Pterognathia vilii Sterrer, 1991
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