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 Acanthochitoninae Pilsbry, 1893 see Family Acanthochitonidae Pilsbry, 1893
               Genus Notoplax H. Adams, 1862
                 1 Subgenus Spongiochiton see Genus Craspedochiton Shuttleworth, 1853
                 2 Subgenus Bassethullia Pilsbry, 1928 see Genus Bassethullia Pilsbry, 1928