n = 4
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Semicossyphus darwini | (Jenyns, 1842) | Semicossyphus darwini | Labridae | Galápagos sheephead wrasse |
| Semicossyphus maculatus | (Pérez Canto, 1886) | Semicossyphus darwini | Labridae | Galápagos sheephead wrasse |
| Semicossyphus pulcher | (Ayres, 1854) | Semicossyphus pulcher | Labridae | California sheephead |
| Semicossyphus reticulatus | (Valenciennes, 1839) | Semicossyphus reticulatus | Labridae |