living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Mollusca Linnaeus, 1758 - molluscs
           Class Polyplacophora Blainville, 1816 - chitons
             Subclass Neoloricata Bergenhayn, 1955
               Order Ischnochitonida Bergenhayn, 1930 see Order Chitonida Thiele, 1909
                 Family Callistoplacidae Pilsbry, 1893
                   1 Genus Callistoplax Dall, 1882
                   2 Genus Callistochiton Dall, 1882
                   3 Genus Nuttallina Dall, 1871
                   4 Genus Middendorffia Fischer, 1885
                   5 Genus Ceratozona Dall, 1882
                   6 Genus Nuttalochiton Plate, 1899, nom. inval. see Genus Nuttallochiton Plate, 1899, nom. corr.