Kingdom Animalia Linnaeus, 1758 - animals Phylum Mollusca Linnaeus, 1758 - molluscs Class Polyplacophora Blainville, 1816 - chitons 1 Order Lepidopleurida Thiele, 1910 2 Order Ischnochitonida Bergenhayn, 1930 see Order Chitonida Thiele, 1909 3 Order Acanthochitonida Bergenhayn, 1930 see Suborder Acanthochitonina Bergenhayn, 1930