| Valid name | Gnathophis |
| Synonym | Poutawa Richardson, 1848, by orig. design., 'New Zealand'). |
| Synonym | Type: Myrophis heterognathus Bleeker, 1859, by orig. design., 'Japan'. |
| Synonym | Gnathophis Kaup, 1860 |
| Synonym | Rhynchocymba Jordan and Snyder, 1901, by orig. design., 'Japan'). |
| Synonym | Gender: M; Abh. naturw. Ver. Hamburg, 1859 (1860), 4 (2): 7 |