Original: Pinnipeds ( from Latin pinna , wing or fin , and ped - , foot ) or fin-footed mammals are a widely distributed and diverse group of semiaquatic marine mammals comprising the families Odobenidae ( the walrus ) , Otariidae ( eared seals , including sea lions and fur seals ) , and Phocidae ( earless seals ) .
Simplified: There are three Pinniped families : Odobenidae ( walruses ) , Otariidae ( eared seals , including sea lions and fur seals ) , and Phocidae ( true seals ) .