Between brackets is the number of accepted species

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- Mollusca (133 239)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 078)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 988)
- 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 (1 381)
- Subclass Neoloricata (1 329)
- Order Callochitonida (55)
- Order Chitonida (967)
- Suborder Acanthochitonina (406)
- Suborder Chitonina (561)
- Superfamily Chitonoidea Rafinesque, 1815 (555)
- 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 (186)
- Family Ischnochitonidae Dall, 1889 (266)
- 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 (127)
- 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)
- Genus Stenoplax P. P. Carpenter, 1879 (31)
- Subgenus Stenoplax (Maugerella) P. P. Carpenter, 1879 accepted as Stenoplax (Stenoradsia) P. P. Carpenter, 1879
- Species Stenoplax (Maugerella) conspicua (Dall, 1879) accepted as Stenoplax (Stenoradsia) conspicua (Dall, 1879)
- Subspecies Stenoplax (Maugerella) conspicua sonorana S. S. Berry, 1956 accepted as Stenoplax (Stenoradsia) sonorana S. S. Berry, 1956
- Subgenus Stenoplax (Stenoplax) P. P. Carpenter, 1879 represented as Stenoplax P. P. Carpenter, 1879
- Subgenus Stenoplax (Stenoradsia) P. P. Carpenter, 1879 represented as Stenoplax P. P. Carpenter, 1879
- Species Stenoplax alata (G. B. Sowerby II, 1841)
- Species Stenoplax anglica Wrigley, 1943 †
- Species Stenoplax bahamensis Kaas & Van Belle, 1987
- Species Stenoplax boogii (Haddon, 1886)
- Species Stenoplax circumsenta S. S. Berry, 1956
- Species Stenoplax conspicua (Dall, 1879)
- Species Stenoplax corrugata (P. P. Carpenter, 1892)
- Species Stenoplax fallax (P. P. Carpenter, 1892)
- Species Stenoplax floridana (Pilsbry, 1892)
- Species Stenoplax heathiana S. S. Berry, 1946
- Species Stenoplax hernandezi Dell'Angelo, Schwabe, Gori, Sosso & Bonfitto, 2014
- Species Stenoplax histrio S. S. Berry, 1945 accepted as Stenoplax mariposa (Dall, 1919)
- Species Stenoplax iansa Jardim & Almeida, 2021
- Species Stenoplax isoglypta S. S. Berry, 1956 accepted as Stenoplax boogii (Haddon, 1886)
- Species Stenoplax kempfi (Righi, 1971)
- Species Stenoplax lavanonensis Dell'Angelo, Sirenko & Prelle, 2015
- Species Stenoplax limaciformis (G. B. Sowerby I, 1832)
- Species Stenoplax lindholmii (Schrenck, 1862) accepted as Stenoplax magdalenensis (Hinds, 1845)
- Species Stenoplax madagassica (Thiele, 1917)
- Species Stenoplax magdalenensis (Hinds, 1845)
- Species Stenoplax marcusi (Righi, 1971)
- Species Stenoplax mariposa (Dall, 1919)
- Species Stenoplax monila Cherns & Schwabe, 2019 †
- Species Stenoplax paviai Dell'Angelo, Giuntelli, Sosso & Zunino, 2014 †
- Species Stenoplax petaloides (A. Gould, 1846)
- Species Stenoplax purpurascens (C. B. Adams, 1845)
- Species Stenoplax quetzalcoatli Reyes-Gómez, 2023
- Species Stenoplax quimperensis Dell'Angelo, Bonfitto & Taviani, 2011 †
- Species Stenoplax rugulata (G. B. Sowerby I, 1832)
- Species Stenoplax selseiensis Wrigley, 1943 †
- Species Stenoplax sigillarius Bielokrys, 1999 †
- Species Stenoplax sonorana S. S. Berry, 1956
- Species Stenoplax veneta Dell'Angelo & Palazzi, 1992 †
- Species Stenoplax venusta (Is. Taki & Iw. Taki, 1931)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata