[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Mollusca Linnaeus, 1758 - molluscs
         Branch Eucephala
           Grade Echinoglossa
             Class Gastropoda Cuvier, 1795 - snails and slugs
               Grade Amphomœa
                 Order Polyplacophora Gray, 1821
                   1 Genus Chiton Linnaeus, 1758
                   2 Genus Chitonellus Lamarck, 1819 see Genus Cryptoplax Blainville, 1818