Phylum Mollusca Linnaeus, 1758 - molluscs
   Subphylum Aculifera Hatschek, 1891
     Class Polyplacophora Blainville, 1816 - chitons
       Order Neoloricata Bergenhayn, 1955 see Subclass Neoloricata Bergenhayn, 1955
         Suborder Ischnochitonina Bergenhayn, 1930 see Suborder Chitonina Thiele, 1909
           Family Ischnochitonidae Dall, 1889
             1 Subfamily Callistoplacinae Pilsbry, 1893 see Family Callistoplacidae Pilsbry, 1893
             2 Subfamily Callochitoninae Plate, 1901 see Family Callochitonidae Plate, 1901
             3 Subfamily Chaetopleurinae Plate, 1899 see Family Chaetopleuridae Plate, 1899
             4 Subfamily Ischnochitoninae Dall, 1889 see Family Ischnochitonidae Dall, 1889
             5 Subfamily Lepidochitoninae Iredale, 1914
             6 Subfamily Schizoplacinae Bergenhayn, 1955 see Family Schizoplacidae Bergenhayn, 1955