Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Subphylum Aculifera Hatschek, 1891
             Class Placophora von Ihering, 1876 see Class Polyplacophora Blainville, 1816
               Order Ischnochitonina (Bergenhayn, 1930)
                 1 Family Subterenochitonidae see Family Ischnochitonidae Dall, 1889
                 2 Family Ischnochitonidae Dall, 1889
                 3 Family Schizoplacidae Bergenhayn, 1955
                 4 Family Chitonidae Rafinesque, 1815
                 5 Family Callistoplacidae Pilsbry, 1893
                 6 Family Schizochitonidae Dall, 1889
                 7 Family Callochitonidae Plate, 1901
                 8 Family Mopaliidae Dall, 1889
                 9 Family Chaetopleuridae Plate, 1899