Imperium naturae C. Linnaeus, 1758 - nature Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758 Class Mammalia Linnaeus, 1758 - mammals Ungulata Linnaeus, 1766 5 Order Pecora Linnaeus, 1758 see Infraorder Pecora Linnaeus, 1758 6 Order Belluae Linnaeus, 1758