They comprise the extant families Odobenidae ( whose only living member is the walrus ) , Otariidae ( the eared seals : sea lions and fur seals ) , and Phocidae ( the earless , or true seals ) .
There are three Pinniped families : Odobenidae ( walruses ) , Otariidae ( eared seals , including sea lions and fur seals ) , and Phocidae ( true seals ) .