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 Ischnochitonidae Dall, 1889
             Subfamily Callochitoninae Plate, 1901 see Family Callochitonidae Plate, 1901
               Genus Callochiton Gray, 1847
                 Subgenus Acutoplax Cotton & Weeding, 1939