Pinnipeds are seals, sea lions, and walruses.
Some scientists classify the pinnipeds as a suborder of the order Carnivora. The Pacific walrus is larger, with longer tusks and a wider skull. A third subspecies, Odobenus rosmarus laptevi , has been suggested based on specimens from the Laptev Sea in the Pacific Ocean. O. r. laptevi has skull characteristics similar to the Pacific walrus. Its size is intermediate to the Atlantic and Pacific subspecies.