Phylum Mollusca Linnaeus, 1758 - molluscs Class Polyplacophora Blainville, 1816 [monotypic] - chitons Subclass Polyplacophora Gray, 1821 [monotypic] see Class Polyplacophora Blainville, 1816 Order Lepidopleurida Thiele, 1910 Suborder Acanthochitonina Bergenhayn, 1930 Family Acanthochitonidae Pilsbry, 1893 Subfamily Cryptochitoninae Pilsbry, 1893 [monotypic] Genus Cryptochiton von Middendorff, 1847