Odobenus mandanoensis

Odobenus mandanoensis is an extinct species of walrus in the genus Odobenus, the genus that also holds the living walrus Odobenus rosmarus. Tomida named it in 1989. The Paleobiology Database holds a single record for it, from Chiba Prefecture in Japan, and dates that record to the Chibanian stage of the Pleistocene, between about 0.77 and 0.13 million years ago, which makes it a comparatively recent fossil relative of the living walrus. The Global Biodiversity Information Facility lists it as an accepted species of the family Odobenidae. The pages read for this entry say nothing about its anatomy, size or diet, so the entry records only its identity, age, place and position in the family.