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 Mopaliidae Dall, 1889
                   1 Genus Mopalia Gray, 1847
                   2 Genus Plaxiphora Gray, 1847
                   3 Genus Fremblya Dall, 1882, nom. null. see Genus Frembleya H. Adams, 1867
                   5 Genus Amicula Gray, 1840
                   6 Genus Katharina Gray, 1847
                   7 Genus Placiphorella Dall, 1879