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 Lepidochitoninae Iredale, 1914
               1 Genus Lepidochitona Gray, 1821
               2 Genus Nuttallina Dall, 1871
               3 Genus Particulazona Kaas, 1993
               4 Genus Tonicella Carpenter, 1873
               5 Genus Subterenochiton Iredale & Hull, 1924
               6 Genus Juvenichiton Sirenko, 1975