Onychognathiidae

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

Genera:
 * Goannagnathia Sterrer, 2001
 * Nanognathia Sterrer, 1972
 * Onychognathia Riedl, 1971
 * Valvognathia Kristensen & Nørrevang, 1978
 * Vampyrognathia Sterrer, 1998