| Kingdom | Phylum | Order |
|---|---|---|
| Animalia | Gnathostomulida | Bursovaginoidea |
| Rank | Scientific name | Taxonomic status |
|---|---|---|
| genus | Goannagnathia Sterrer, 2001-01 | accepted |
| genus | Nanognathia Sterrer, 1972-19 | accepted |
| genus | Onychognathia Riedl, 1971 | accepted |
| genus | Valvognathia Kristensen & Nørrevang, 1978 | accepted |
| genus | Vampyrognathia Sterrer, 1998 | accepted |
Onychognathiidae. GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via biodiversity.aq on 2019-11-17.