Class [Mammalia] Linnaeus, 1758 - mammals
   Order Carnivora Bowdich, 1821 - carnivores
     Family Mustelidae Batsch, 1788 - weasels, badgers, skunks, and otters
       Genus Lutra Brisson, 1762 - river otters
         1 Lutra canadensis Schreber, [1777] - Canadian otter see Lontra canadensis (Schreber, 1777)
         2 Lutra felina Molina, 1782 see Lontra felina (Molina, 1782)
         3 Lutra longicaudis Olfers, in Eschwege, 1818 see Lontra longicaudis (Olfers, 1818)
         4 Lutra lutra (Linnaeus, 1758) - European otter
         5 Lutra maculicollis Lichtenstein, 1835 - spotted-necked otter see Hydrictis maculicollis (Lichtenstein, 1835)
         6 Lutra perspicillata I. Geoffroy Saint-Hilaire, in Bory de Saint-Vincent, 1826 - smooth-coated otter see Lutrogale perspicillata (Geoffroy, 1826)
         7 Lutra provocax Thomas, 1908 see Lontra provocax (Thomas, 1908)
         8 Lutra sumatrana (Gray, 1865) - hairy-nosed otter