Family Mustelidae - Otters (2 marine species in 2 genera)
The mustelids are the otters, weasels, and their kin. Other mustelids include the minks, polecats, martens, wolverines, skunks, and badgers. Only 2 of the 67 species in this family are truly marine, the sea otter and the marine otter. It is clear that “fresh-water” otters in certain areas enter marine waters; however, we restrict our treatment to species usually considered among marine mammals. Otters are often classified in their own subfamily, the Lutrinae (containing 12 species).
Genus Enhydra containing 1 marine species:
Enhydra lutris (Sea otter)
Genus Lutra containing 1 marine species:
Lutra felina (Marine otter)