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 Lutra Brisson, 1762 - river otters
               Lutra lutra (Linnaeus, 1758) - European otter
                 01 [Lutra lutra lutra] (Linnaeus, 1758)
                 02 Lutra lutra angustifrons Lataste, 1885
                 03 Lutra lutra aurobrunneus Hodgson, 1839
                 04 Lutra lutra barang Cuvier, 1823
                 05 Lutra lutra chinensis Gray, 1837
                 06 Lutra lutra hainana Xu & Liu, 1983
                 07 Lutra lutra kutab Schinz, 1844
                 08 Lutra lutra meridionalis Ognev, 1931
                 09 Lutra lutra monticolus Hodgson, 1839
                 10 Lutra lutra nair Cuvier, 1823
                 11 Lutra lutra seistanica Birula, 1913