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 Chitonidae Rafinesque, 1815
             Subfamily Toniciinae Pilsbry, 1893
               Genus Tonicia Gray, 1847
                 Subgenus Lucilina Dall, 1882 see Genus Lucilina Dall, 1882