Phocoena
Phocoena is a genus of porpoises with four extant species:
| Image | Scientific name | Common name | Distribution |
| Phocoena dioptrica | Spectacled porpoise | circumpolar in cool sub-Antarctic and low Antarctic waters | |
| Phocoena phocoena | Harbour porpoise | cooler coastal waters of the North Atlantic, North Pacific and the Black Sea | |
| Phocoena sinus | Vaquita | northern area of the Gulf of California, or Sea of Cortez | |
| Phocoena spinipinnis | Burmeister's porpoise | coast of South America |