| Latax lutris subsp. nereis Merriam, 1904 |
| Lontra J. E. Gray, 1843 |
| Lontra annectens (Major, 1897) |
| Lontra canadensis (Schreber, 1776) |
| Lontra canadensis subsp. lataxina (Cuvier, 1823) |
| Lontra canadensis subsp. sonorae (Rhoads, 1898) |
| Lontra longicaudis (Olfers, 1818) |
| Lontra longicaudis subsp. annectens (Major, 1897) |
| Lutra Brisson, 1762 |
| Lutra annectens Major, 1897 |
| Lutra annectens subsp. annectens Major, 1897 |
| Lutra annectens subsp. latidens Pohle, 1920 |
| Lutra hudsonica Desmarest, 1803 |
| Lutra hudsonica subsp. sonora Rhoads, 1898 |
| Lutra lataxina Cuvier, 1823 |
| Lutra latidens (J. A. Allen, 1908) |
| Lutra longicaudis Olfers, 1818 |
| Lutra longicaudis subsp. annectens Major, 1897 |
| Lutra minima Zimmermann, 1780 |
| Lutrinae Bonaparte, 1838 |