An isolated population in the Laptev Sea is considered by some authorities, including many Russian biologists and the canonical Mammal Species of the World, to be a third subspecies, O. r. laptevi (Chapskii, 1940), and is managed as such in Russia.
En isoleret bestand i Laptevhavet betragtes af mange, inklusive mange russiske biologier og værket Mammal Species of the World, for at være en tredje underart, O. r. laptevi (Chapskii, 1940), og den bliver behandlet som sådan i Rusland.