n = 9
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Oplegnathus algoensis | Gilchrist & Thompson, 1916 | Oplegnathus conwayi | Oplegnathidae | Cape knifejaw |
| Oplegnathus conwaii | Richardson, 1840 | Oplegnathus conwayi | Oplegnathidae | Cape knifejaw |
| Oplegnathus conwayi | Richardson, 1840 | Oplegnathus conwayi | Oplegnathidae | Cape knifejaw |
| Oplegnathus fasciatus | (Temminck & Schlegel, 1844) | Oplegnathus fasciatus | Oplegnathidae | Barred knifejaw |
| Oplegnathus insignis | (Kner, 1867) | Oplegnathus insignis | Oplegnathidae | Pacific beakfish |
| Oplegnathus peaolopesi | Smith, 1947 | Oplegnathus peaolopesi | Oplegnathidae | Mozambique knifejaw |
| Oplegnathus punctatus | (Temminck & Schlegel, 1844) | Oplegnathus punctatus | Oplegnathidae | Spotted knifejaw |
| Oplegnathus robinsoni | Regan, 1916 | Oplegnathus robinsoni | Oplegnathidae | Natal knifejaw |
| Oplegnathus woodwardi | Waite, 1900 | Oplegnathus woodwardi | Oplegnathidae | Knifejaw |