Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Subclass Neoloricata (1 325)
- Order Callochitonida (55)
- Order Chitonida (963)
- Suborder Acanthochitonina (405)
- Suborder Chitonina (558)
- Superfamily Chitonoidea Rafinesque, 1815 (552)
- Family Acanthopleuridae Dall, 1889 accepted as Acanthopleurinae Dall, 1889
- Family Bathychitonidae dell'Angelo & Palazzi accepted as Ischnochitonidae Dall, 1889
- Family Callistoplacidae Pilsbry, 1893 (48)
- Family Chaetopleuridae Plate, 1899 (33)
- Family Chitonidae Rafinesque, 1815 (185)
- Family Ischnochitonidae Dall, 1889 (264)
- Subfamily Callistoplacinae Pilsbry, 1893 accepted as Callistoplacidae Pilsbry, 1893
- Subfamily Ischnochitoninae Dall, 1889
- Genus Barbadoschiton Sirenko & B. Anseeuw, 2024 (1)
- Genus Basiliochiton S. S. Berry, 1918 accepted as Dendrochiton S. S. Berry, 1911
- Genus Bathychiton Dell'Angelo & Palazzi, 1988 accepted as Connexochiton Kaas, 1979
- Genus Connexochiton Kaas, 1979 (8)
- Genus Gurjanovillia Yakovleva, 1952 accepted as Tripoplax S. S. Berry, 1919
- Genus Heterozona P. P. Carpenter, 1879 accepted as Ischnochiton (Heterozona) P. P. Carpenter, 1879
- Genus Ischnochiton J. E. Gray, 1847 (125)
- Genus Ischnoradsia Shuttleworth, 1853 accepted as Ischnochiton (Ischnoradsia) Shuttleworth, 1853
- Genus Lepidoradsia P. P. Carpenter, 1879 accepted as Ischnoradsia Shuttleworth, 1853
- Genus Lepidozona Pilsbry, 1892 (41)
- Genus Leptopleura Thiele, 1893 accepted as Stenoplax P. P. Carpenter, 1879
- Genus Lophyriscus Thiele, 1893 accepted as Ischnochiton J. E. Gray, 1847
- Genus Lophyropsis Thiele, 1893 accepted as Ischnochiton J. E. Gray, 1847
- Genus Maugerella P. P. Carpenter, 1879 accepted as Stenoplax P. P. Carpenter, 1879
- Genus Paricoplax Iredale & Hull, 1929 accepted as Callochiton J. E. Gray, 1847
- Genus Pterygochiton Rochebrune, 1883 † (1)
- Genus Radsiella Pilsbry, 1892
- Genus Radsiella Thiele, 1893 accepted as Ischnochiton J. E. Gray, 1847
- Genus Rhodoplax Thiele, 1893 accepted as Ischnochiton J. E. Gray, 1847
- Genus Stenochiton H. Adams & Angas, 1864 (4)
- Subgenus Stenochiton (Zostericola) Ashby, 1919 accepted as Stenochiton H. Adams & Angas, 1864
- Species Stenochiton cymodocealis Ashby, 1918
- Species Stenochiton juloides H. Adams & Angas, 1864 accepted as Stenochiton longicymba (Blainville, 1825)
- Species Stenochiton longicymba (Blainville, 1825)
- Subspecies Stenochiton longicymba historia Iredale & Hull, 1924 accepted as Stenochiton longicymba (Blainville, 1825)
- Species Stenochiton nubilus (Cochran, 1993)
- Species Stenochiton pilsbryanus (Bednall, 1897)
- Species Stenochiton posidonialis Ashby, 1918 accepted as Stenochiton pilsbryanus (Bednall, 1897)
- Species Stenochiton tatei Ashby, 1927 accepted as Stenochiton pilsbryanus (Bednall, 1897)
- Genus Stenoplax P. P. Carpenter, 1879 (31)
- Genus Stenoradsia P. P. Carpenter, 1879 accepted as Stenoplax (Stenoradsia) P. P. Carpenter, 1879
- Genus Stenosemus Middendorff, 1847 (28)
- Genus Strigichiton Hull, 1923 accepted as Ischnochiton J. E. Gray, 1847
- Genus Subterenochiton Iredale & Hull, 1924 (4)
- Genus Thermochiton Saito & Okutani, 1990 (3)
- Genus Tonicina Thiele, 1906 (1)
- Genus Tripoplax S. S. Berry, 1919 (17)
- Genus Variolepis Plate, 1899 accepted as Chaetopleura Shuttleworth, 1853
- Genus Zostericola Ashby, 1919 accepted as Stenochiton H. Adams & Angas, 1864
- Family Loricidae Iredale & Hull, 1923 (20)
- Family Ochmazochitonidae R. D. Hoare & A. G. Smith, 1984 † (1)
- Family Spinochitonidae Dell'Angelo, Lesport, Cluzaud & Sosso, 2019 † (1)
- Superfamily Schizochitonoidea Dall, 1889 (6)
- Suborder Ischnochitonina accepted as Chitonina
- Order Lepidopleurida (307)
- Subclass Palaeoloricata † (47)
- Subclass Polyplacophora incertae sedis † (5)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata