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Mesognathariidae
Family, Gnathostomulid, Marine
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Onychognathiidae
Family, Gnathostomulid, Marine
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Pterognathia
Genus, Gnathostomulid, Marine
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Pterognathia swedmarki
Species, Gnathostomulid, Marine
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Pterognathiidae
Family, Gnathostomulid, Marine
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Rastrognathia
Genus, Gnathostomulid, Marine
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Rastrognathia macrostoma
Species, Gnathostomulid, Marine
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Rastrognathiidae
Family, Gnathostomulid, Marine
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Valvognathia
Genus, Gnathostomulid, Marine
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Valvognathia pogonostoma
Species, Gnathostomulid, Marine