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 sumatrana (Gray, 1865) - hairy-nosed otter