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 Chitonina Thiele, 1909
           Family Ischnochitonidae Dall, 1889
             Subfamily Ischnochitoninae Dall, 1889 see Family Ischnochitonidae Dall, 1889
               Genus Ischnochiton Gray, 1847
                 1 Subgenus Ischnochiton Gray, 1847
                 2 Subgenus Simplischnochiton Van Belle, 1974
                 3 Subgenus Stenosemus von Middendorff, 1847 see Genus Stenosemus von Middendorff, 1848
                 4 Subgenus Ischnoradsia Shuttleworth, 1853
                 5 Subgenus Heterozona Dall, 1878
                 6 Subgenus Haploplax Pilsbry, 1894
                 7 Subgenus Autochiton Iredale & Hull, 1924