Tetronarce
Tetronarce is a genus of rays, commonly known as electric rays. They are slow-moving bottom-dwellers capable of generating electricity as a defense and feeding mechanism. Tetronarce species tend to attain a much larger size than Torpedo species, which are usually small to moderate sized electric rays.
Species
There are currently nine recognized species in this genus:| Image | Name | Common name | Distribution |
| Tetronarce californica Ayres, 1855 | Pacific electric ray | northeastern Pacific Ocean from Baja California to British Columbia. | |
| Tetronarce cowleyi Ebert, D. L. Haas & M. R. de Carvalho, 2015 | Cowley's torpedo ray | around southern Africa, from Walvis Bay, Namibia to Algoa Bay, Eastern Cape, South Africa | |
| Tetronarce fairchildi F. W. Hutton, 1872 | New Zealand torpedo | New Zealand | |
| Tetronarce formosa D. L. Haas & Ebert, 2006 | Taiwan torpedo | Northwest Pacific: Taiwan. | |
| Tetronarce macneilli Whitley, 1932 | Shorttail torpedo | southern Australia from Port Hedland to the Swain Reefs | |
| Tetronarce nobiliana Bonaparte, 1835 | Atlantic torpedo | Atlantic Ocean, from Nova Scotia to Brazil in the west and from Scotland to West Africa and off southern Africa in the east | |
| Tetronarce puelcha Lahille, 1926 | Argentine torpedo | Argentina, Brazil, and Uruguay. | |
| Tetronarce tokionis S. Tanaka, 1908 | Trapezoid torpedo | Japan and Taiwan. | |
| Tetronarce tremens F. de Buen, 1959 | Chilean torpedo | Chile, Colombia, Costa Rica, Ecuador, and Peru. |