Acanthochitonidae
                                    Callistoplacidae
                                    Callochitonidae
                                    Chaetopleuridae
                                    Chitonidae
                                    Ischnochitonidae
                                    Lepidochitonidae
                                    Lepidopleuridae
                                    Schizochitonidae
                  Chitonida
                        Acanthochitonina
                                    Cryptoplacidae
                              Mopalioidea
                                    Mopaliidae
                                    Schizoplacidae
                        Chitonina
                              Chitonoidea
                                    Loricidae