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 Mopaliidae Dall, 1889
             Subfamily Mopaliinae Dall, 1889
               1 Genus Mopalia Gray, 1847
               2 Genus Plaxiphora Gray, 1847
               3 Genus Amicula Gray, 1840
               4 Genus Placiphorella Dall, 1879
               5 Genus Placiphorina Kaas & Van Belle, 1994