Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Mustelidae Batsch, 1788 - weasels, badgers, skunks, and otters
           Subfamily Lutrinae Bonaparte, 1838 - otters
             Genus Lontra Gray, 1843
               Lontra longicaudis (Olfers, 1818) - Neotropical otter
                 1 [Lontra longicaudis longicaudis] (Olfers, 1818)
                 2 Lontra longicaudis annectens (Major, 1897)
                 3 Lontra longicaudis enudris (Cuvier, 1823)