Arctoidea is a clade of mostly carnivorous mammals which include the extinct Hemicyonidae (dog-bears), and the extant Musteloidea (weasels, raccoons, skunks, red pandas), Pinnipedia (seals, sea lions), and Ursidae (bears), found in all continents from the Eocene, 46 million years ago, to the present.

[2] The oldest group of the clade is the bears, as their CMAH gene is still intact.

Together with feliforms, caniforms compose the order Carnivora; sometimes Arctoidea can be considered a separate suborder from Caniformia and a sister taxon to Feliformia.

[4][5][6] The cladogram is based on molecular phylogeny of six genes in Flynn (2005),[7] with the musteloids updated following the multigene analysis of Law et al.

[8] Amphicyonidae† Canidae Hemicyonidae† Ursidae Enaliarctidae† Phocidae Otariidae Odobenidae Mephitidae Ailuridae Procyonidae Mustelidae