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 Hanleyidae Bergenhayn, 1955
             1 Genus Hanleya Gray, 1857
             2 Genus Hemiarthrum Dall, 1876
             3 Genus Xylochiton Gowlett-Holmes & Jones, 1992 see Genus Ferreiraella Sirenko, 1988