Gnathostomulidae is a family of worms belonging to the order Bursovaginoidea.

Genera: Chirognathia Sterrer & Sørensen, 2006 Corculognathia Ehlers & Ehlers, 1973 Gnathostomula Ax, 1956 Ratugnathia Sterrer, 1991 Semaeognathia Riedl, 1970

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