n = 5
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Letharchus aliculatus | McCosker, 1974 | Letharchus aliculatus | Ophichthidae | |
| Letharchus opercularis | Myers & Wade, 1941 | Paraletharchus opercularis | Ophichthidae | Pouch snake eel |
| Letharchus pacificus | Osburn & Nichols, 1916 | Paraletharchus pacificus | Ophichthidae | Pacific sailfin eel |
| Letharchus rosenblatti | McCosker, 1974 | Letharchus rosenblatti | Ophichthidae | Sailfin snake-eel |
| Letharchus velifer | Goode & Bean, 1882 | Letharchus velifer | Ophichthidae | Sailfin eel |