n = 4
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Phenacostethus posthon | Roberts, 1971 | Phenacostethus posthon | Phallostethidae | |
| Phenacostethus smithi | Myers, 1928 | Phenacostethus smithi | Phallostethidae | Smith's priapium fish |
| Phenacostethus thai | Fowler, 1937 | Phenacostethus smithi | Phallostethidae | Smith's priapium fish |
| Phenacostethus trewavasae | Parenti, 1986 | Phenacostethus trewavasae | Phallostethidae |