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
           1 Family Ischnochitonidae Dall, 1889
           2 Family Mopaliidae Dall, 1889
           3 Family Schizochitonidae Dall, 1889
           4 Family Chitonidae Rafinesque, 1815
           5 Family Bathychitonidae dell'Angelo & Palazzi, 1988 [monotypic] see Family Ischnochitonidae Dall, 1889