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 Lepidopleurina Thiele, 1910
           Family Leptochitonidae Dall, 1889
             Subfamily Leptochitoninae Dall, 1889 see Family Leptochitonidae Dall, 1889
               Genus Oldroydia Dall, 1894