Mammalia - Carnivora - Odobenidae

Full reference: H. Horikawa. 1995. A primitive odobenine walrus of Early Pliocene age from Japan. The Island Arc 3:309-328

Belongs to Protodobenus according to R. W. Boessenecker and M. Churchill 2013

Sister taxa: none

Type specimen: Its type locality is Iriyama, which is in a Zanclean offshore mudstone in the Tamigigawa Formation of Japan

Ecology: amphibious carnivore