Gnathostomulidae

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