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
             1 Subfamily Acanthochitoninae Pilsbry, 1893 see Family Acanthochitonidae Pilsbry, 1893
             2 Subfamily Cryptochitoninae Pilsbry, 1893 [monotypic]