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 Enhydra Fleming, 1822 [monotypic] - sea otter
Enhydra lutris (Linnaeus, 1758) - sea otter
Enhydra lutris nereis (Merriam, 1904) - southern sea otter