Mammalia Linnaeus, 1758 - mammals
   Carnivora Bowdich, 1821 - carnivores
     Mustelidae Batsch, 1788 - weasels, badgers, skunks, and otters
       Lutrinae Bonaparte, 1838 - otters
         1 Amblonyx Rafinesque, 1832 see Genus Aonyx Lesson, 1827
         2 Aonyx Lesson, 1827 - clawless otters
         3 Enhydra Fleming, 1822 - sea otter
         4 Lontra Gray, 1843
         5 Lutra Brisson, 1762 - river otters
         6 Lutrogale Gray, 1865
         7 Pteronura Gray, 1837 - giant otter