出典:Wikipedia
出典:『Wikipedia』 (2011/03/24 22:30 UTC 版)
Arctoidea is a superfamily of extinct and extant mostly carnivorous mammals which include the extinct group Hemicyonidae (dog-bears), and extant groups Musteloidea (weasels), Nothocyon, Pinnipedia (seals, sea lions), and Ursidae (bears), found in all continents from the Eocene, 46 Ma ago, to the present, approximately 46 million years..