Kronokotherium is an extinct herbivorous marine mammal of the genus Desmostylia of the family Desmostylidae. Its type locality is Raktinskaya, Kamchatka Peninsula, Russia (55°00′N 161°36′E / 55.0°N 161.6°E, paleocoordinates 55°42′N 163°00′E / 55.7°N 163.0°E). Kronokotherium was made a separate genus because the specimen differs from Desmostylus in the arrangement of the major molar cusps and its smaller size, but it has been synonymized with Desmostylus by most authors.