Polyplacophora, truoc đay co ten Amphineura, la mot lop đong vat than mem, song bien voi kich thuoc đa dang. Khoang 940 loai con sinh ton va 430 loai hoa thach đuoc ghi nhan.
Cac loai trong lop nay co mot bo vo đuoc tao nen tu tam manh vo. Cac manh vo nay hoi đe len nhau, nhung van khop lai chinh xac. Vi đieu nay, cac mang vo vua bao ve vua đong thoi cho phep chung uon nguoi khi can di chuyen o be mat khong bang phang; chung tham chi co the cuon tron lai nhu mot trai bong.
Loai co kich thuoc lon nhat la Cryptochiton stelleri, cu ngu o cac bo bien bac Thai Binh Duong.


Moi truong song Cac loai Polyplacophora hien dien tren toan the gioi, tu vung nuoc lanh đen mien nhiet đoi. Chung song tren cac be mat cung, nhu tren đa, va ke đa.
Chung song hoan toan o bien. Đieu nay khac voi cac than mem hai manh vo (voi nhieu loai thich ung voi moi truong nuoc lo va nuoc ngot), va chan bung (thich ung voi moi truong tren can).


Phan loai Lop Polyplacophora de Blainville, 1816
Phan lop Paleoloricata Bergenhayn, 1955
Bo Chelodida Bergenhayn, 1943
Ho Chelodidae Bergenhayn, 1943
Chelodes Davidson et King, 1874
Euchelodes Marek, 1962
Calceochiton Flower, 1968
Bo Septemchitonida Bergenhayn, 1955
Ho Gotlandochitonidae Bergenhayn, 1955
Gotlandochiton Bergenhayn, 1955
Ho Helminthochitonidae Van Belle, 1975
Kindbladochiton Van Belle, 1975
Diadelochiton Hoare, 2000
Helminthochiton Salter in Griffith et M'Coy, 1846
Echinochiton Pojeta, Eernisse, Hoare et Henderson, 2003
Ho Septemchitonidae Bergenhayn, 1955
Septemchiton Bergenhayn, 1955
Paleochiton A. G. Smith, 1964
Thairoplax Cherns, 1998
Phan lop Loricata Shumacher, 1817
Bo Lepidopleurida Thiele, 1910
Phan bo Cymatochitonina Sirenko et Starobogatov, 1977
Ho Acutichitonidae Hoare, Mapes et Atwater, 1983
Acutichiton Hoare, Sturgeon et Hoare, 1972
Elachychiton Hoare, Sturgeon et Hoare, 1972
Harpidochiton Hoare et Cook, 2000
Arcochiton Hoare, Sturgeon et Hoare, 1972
Kraterochiton Hoare, 2000
Soleachiton Hoare, Sturgeon et Hoare, 1972
Asketochiton Hoare et Sabattini, 2000
Ho Cymatochitonidae Sirenko et Starobogatov, 1977
Cymatochiton Dall, 1882
Compsochiton Hoare et Cook, 2000
Ho Gryphochitonidae Pilsbry, 1900
Gryphochiton Gray, 1847
Ho Lekiskochitonidae Smith et Hoare, 1987
Lekiskochiton Hoare et Smith, 1984
Ho Permochitonidae Sirenko et Starobogatov, 1977
Permochiton Iredale et Hull, 1926
Phan bo Lepidopleurina Thiele, 1910
Ho Abyssochitonidae (synonym:Ferreiraellidae) Dell’ Angelo et Palazzi, 1991
Glaphurochiton Raymond, 1910
?Pyknochiton Hoare, 2000
?Hadrochiton Hoare, 2000
Ferreiraella Sirenko, 1988
Ho Glyptochitonidae Starobogatov et Sirenko, 1975
Glyptochiton Konninck, 1883
Ho Leptochitonidae Dall, 1889
Colapterochiton Hoare et Mapes, 1985
Coryssochiton DeBrock, Hoare et Mapes, 1984
Proleptochiton Sirenko et Starobogatov, 1977
Schematochiton Hoare, 2002
Pterochiton (Carpenter MS) Dall, 1882
Leptochiton Gray, 1847
Parachiton Thiele, 1909
Terenochiton Iredale, 1914
Trachypleura Jaeckel, 1900
Pseudoischnochiton Ashby, 1930
Lepidopleurus Risso, 1826
Hanleyella Sirenko, 1973
Ho Camptochitonidae Sirenko, 1997
Camptochiton DeBrock, Hoare et Mapes, 1984
Pedanochiton DeBrock, Hoare et Mapes, 1984
Euleptochiton Hoare et Mapes, 1985
Pileochiton DeBrock, Hoare et Mapes, 1984
Chauliochiton Hoare et Smith, 1984
Stegochiton Hoare et Smith, 1984
Ho Nierstraszellidae Sirenko, 1992
Nierstraszella Sirenko, 1992
Ho Mesochitonidae Dell’ Angelo et Palazzi, 1989
Mesochiton Van Belle, 1975
Pterygochiton Rochebrune, 1883
Ho Protochitonidae Ashby, 1925
Protochiton Ashby, 1925
Deshayesiella (Carpenter MS) Dall, 1879
Oldroydia Dall, 1894
Ho Hanleyidae Bergenhayn, 1955
Hanleya Gray, 1857
Hemiarthrum Dall, 1876
Bo Chitonida Thiele, 1910
Phan bo Chitonina Thiele, 1910
Lien ho Chitonoidea Rafinesque, 1815
Ho Ochmazochitonidae Hoare et Smith, 1984
Ochmazochiton Hoare et Smith, 1984
Ho Ischnochitonidae Dall, 1889
Ischnochiton Gray, 1847
Stenochiton H. Adams et Angas, 1864
Stenoplax (Carpenter MS) Dall, 1879
Lepidozona Pilsbry, 1892
Stenosemus Middendorff, 1847
Subterenochiton Iredale et Hull, 1924
Thermochiton Saito et Okutani, 1990
Connexochiton Kaas, 1979
Tonicina Thiele, 1906
Ho Callistoplacidae Pilsbry, 1893
Ischnoplax Dall, 1879
Callistochiton Carpenter MS, Dall, 1879
Callistoplax Dall, 1882
Ceratozona Dall, 1882
Calloplax Thiele, 1909
Ho Chaetopleuridae Plate, 1899
Chaetopleura Shuttleworth, 1853
Dinoplax Carpenter MS, Dall, 1882
Ho Loricidae Iredale et Hull, 1923
Lorica H. et A. Adams, 1852
Loricella Pilsbry, 1893
Oochiton Ashby, 1929
Ho Callochitonidae Plate, 1901
Callochiton Gray, 1847
Eudoxochiton Shuttleworth, 1853
Vermichiton Kaas, 1979
Ho Chitonidae Rafinesque, 1815
Phan ho Chitoninae Rafinesque, 1815
Chiton Linnaeus, 1758
Amaurochiton Thiele, 1893
Radsia Gray, 1847
Sypharochiton Thiele, 1893
Nodiplax Beu, 1967
Rhyssoplax Thiele, 1893
Teguloaplax Iredale & Hull, 1926
Mucrosquama Iredale, 1893
Phan ho Toniciinae Pilsbry, 1893
Tonicia Gray, 1847
Onithochiton Gray, 1847
Phan ho Acanthopleurinae Dall, 1889
Acanthopleura Guilding, 1829
Liolophura Pilsbry, 1893
Enoplochiton Gray, 1847
Squamopleura Nierstrasz, 1905
Lien ho Schizochitonoidea Dall, 1889
Ho Schizochitonidae Dall, 1889
Incissiochiton Van Belle, 1985
Schizochiton Gray, 1847
Phan bo Acanthochitonina Bergenhayn, 1930
Lien ho Mopalioidea Dall, 1889
Ho Tonicellidae Simroth, 1894
Phan ho Tonicellinae Simroth, 1894
Lepidochitona Gray, 1821
Particulazona Kaas, 1993
Boreochiton Sars, 1878
Tonicella Carpenter, 1873
Nuttallina (Carpenter MS) Dall, 1871
Spongioradsia Pilsbry, 1894
Oligochiton Berry, 1922
Phan ho Juvenichitoninae Sirenko, 1975
Juvenichiton Sirenko, 1975
Micichiton Sirenko, 1975
Nanichiton Sirenko, 1975
Ho Schizoplacidae Bergenhayn, 1955
Schizoplax Dall, 1878
Ho Mopaliidae Dall, 1889
Phan ho Heterochitoninae Van Belle, 1978
Heterochiton Fucini, 1912
Allochiton Fucini, 1912
Phan ho Mopaliinae Dall, 1889
Aerilamma Hull, 1924
Guildingia Pilsbry, 1893
Frembleya H. Adams, 1866
Diaphoroplax Iredale, 1914
Plaxiphora Gray, 1847
Placiphorina Kaas & Van Belle, 1994
Nuttallochiton Plate, 1899
Mopalia Gray, 1847
Maorichiton Iredale, 1914
Placiphorella (Carpenter MS) Dall, 1879
Katharina Gray, 1847
Amicula Gray, 1847
Lien ho Cryptoplacoidea H. & A. Adams, 1858
Ho Acanthochitonidae Pilsbry, 1893
Phan ho Acanthochitoninae Pilsbry, 1893
Acanthochitona Gray, 1921
Craspedochiton Shuttleworth, 1853
Spongiochiton (Carpenter MS) Dall, 1882
Notoplax H. Adams, 1861
Pseudotonicia Ashby, 1928
Bassethullia Pilsbry, 1928
Americhiton Watters, 1990
Choneplax (Carpenter MS) Dall, 1882
Cryptoconchus (de Blainville MS) Burrow, 1815
Phan ho Cryptochitoninae Pilsbry, 1893
Cryptochiton Middendorff, 1847
Ho Hemiarthridae Sirenko, 1997
Hemiarthrum Carpenter in Dall, 1876
Weedingia Kaas, 1988
Ho Choriplacidae Ashby, 1928
Choriplax Pilsbry, 1894
Ho Cryptoplacidae H. & A. Adams, 1858
Cryptoplax de Blainville, 1818
Incertae sedis
Ho Scanochitonidae Bergenhayn, 1955
Scanochiton Bergenhayn, 1955
Ho Olingechitonidae Starobogatov et Sirenko, 1977
Olingechiton Bergenhayn, 1943
Ho Haeggochitonidae Sirenko et Starobogatov, 1977
Haeggochiton Bergenhayn, 1955
Ho Ivoechitonidae Sirenko et Starobogatov, 1977
Ivoechiton Bergenhayn, 1955


Chu thich Lien ket ngoai Extensive list of species, classified by families