Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- 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)
- Subfamily Chaetopleurinae Plate, 1899 accepted as Chaetopleuridae Plate, 1899
- Genus Chaetopleura Shuttleworth, 1853 (29)
- Subgenus Chaetopleura (Chaetopleura) Shuttleworth, 1853 represented as Chaetopleura Shuttleworth, 1853
- Subgenus Chaetopleura (Pallochiton) Dall, 1879 represented as Chaetopleura Shuttleworth, 1853
- Species Chaetopleura abbessi Cherns & Schwabe, 2019 † accepted as Ischnochiton abbessi (Cherns & Schwabe, 2019) †
- Species Chaetopleura ahnni Rochebrune, 1884 accepted as Plaxiphora (Plaxiphora) aurata (Spalowsky, 1795)
- Species Chaetopleura angolensis Thiele, 1909
- Species Chaetopleura angulata (Spengler, 1797)
- Species Chaetopleura apiculata (Say, 1834)
- Species Chaetopleura armillata P. P. Carpenter, 1892 accepted as Chaetopleura (Chaetopleura) angulata (Spengler, 1797)
- Species Chaetopleura asperior (P. P. Carpenter, 1892)
- Species Chaetopleura asperrima (A. Gould, 1852)
- Species Chaetopleura benaventei Plate, 1899
- Species Chaetopleura benguelensis Kaas & Van Belle, 1987
- Species Chaetopleura biarmata Rochebrune, 1882
- Species Chaetopleura brucei Iredale, 1912
- Species Chaetopleura caboverdensis (Kaas & Strack, 1986)
- Species Chaetopleura chelazziana A. J. Ferreira, 1983 accepted as Dinoplax chelazziana (A. J. Ferreira, 1983)
- Species Chaetopleura conspersa H. Adams & Angas, 1864 accepted as Plaxiphora albida (Blainville, 1825)
- Species Chaetopleura dacrydigera Rochebrune, 1882 accepted as Chaetopleura (Chaetopleura) lurida (G. B. Sowerby I, 1832)
- Species Chaetopleura debruini (Strack, 1996)
- Species Chaetopleura destituta Sykes, 1902 accepted as Chaetopleura papilio (Spengler, 1797)
- Species Chaetopleura euryplax S. S. Berry, 1945 accepted as Chaetopleura (Pallochiton) lanuginosa mixta (Dall, 1919)
- Species Chaetopleura fernandensis Plate, 1899
- Species Chaetopleura frigida Rochebrune, 1889 accepted as Plaxiphora (Plaxiphora) aurata (Spalowsky, 1795)
- Species Chaetopleura fulva (W. Wood, 1815) accepted as Chaetopleura (Chaetopleura) angulata (Spengler, 1797)
- Species Chaetopleura gaasi Cherns & Schwabe, 2019 † accepted as Spinochiton gaasi (Cherns & Schwabe, 2019) †
- Species Chaetopleura gambiensis (Rochebrune, 1881)
- Species Chaetopleura gemma Dall, 1879
- Species Chaetopleura gemmea Pilsbry, 1892 accepted as Chaetopleura gemma Dall, 1879
- Species Chaetopleura hahni Rochebrune, 1889 accepted as Plaxiphora (Plaxiphora) aurata (Spalowsky, 1795)
- Species Chaetopleura hanleyi (W. Bean, 1844) accepted as Hanleya hanleyi (W. Bean, 1844)
- Species Chaetopleura hanselmani (A. J. Ferreira, 1982)
- Species Chaetopleura hennahi (J. E. Gray, 1828)
- Species Chaetopleura isabellei (A. d'Orbigny, 1839)
- Species Chaetopleura janeirensis (Gray, 1828) accepted as Calloplax janeirensis (J. E. Gray, 1828)
- Species Chaetopleura lactica Dall, 1919 accepted as Mopalia acuta (P. P. Carpenter, 1856)
- Species Chaetopleura lanuginosa (Dall, 1879)
- Species Chaetopleura lurida (G. B. Sowerby I, 1832)
- Species Chaetopleura mixta (Dall, 1919) accepted as Chaetopleura (Pallochiton) lanuginosa mixta (Dall, 1919)
- Species Chaetopleura natalensis Kaas & Van Belle, 1990 accepted as Chaetopleura pustulata (Krauss, 1848)
- Species Chaetopleura papilio (Spengler, 1797)
- Species Chaetopleura pertusa (Reeve, 1847)
- Species Chaetopleura peruviana (Lamarck, 1819)
- Species Chaetopleura pomarium Barnard, 1963
- Species Chaetopleura pustulata (Krauss, 1848)
- Species Chaetopleura reesi A. E. Salisbury, 1953 accepted as Chiton viridis Spengler, 1797
- Species Chaetopleura roddai A. J. Ferreira, 1983
- Species Chaetopleura rosetta S. S. Berry, 1907
- Species Chaetopleura savatieri Rochebrune, 1881 accepted as Plaxiphora (Plaxiphora) aurata (Spalowsky, 1795)
- Species Chaetopleura scabricula (G. B. Sowerby I, 1832) accepted as Chaetopleura lurida (G. B. Sowerby I, 1832)
- Species Chaetopleura shyana A. J. Ferreira, 1983
- Species Chaetopleura sowerbiana (Reeve, 1847)
- Species Chaetopleura spinulosa (Gray, 1828)
- Species Chaetopleura staphylophera W. G. Lyons, 1985
- Species Chaetopleura tehuelcha (A. d'Orbigny, 1841) accepted as Chaetopleura (Chaetopleura) angulata (Spengler, 1797)
- Species Chaetopleura thouarsiana Rochebrune, 1882 accepted as Mopalia ciliata (G. B. Sowerby II, 1840)
- Species Chaetopleura unilineata Leloup, 1954
- Species Chaetopleura veneris Rochebrune, 1884 sensu Carcelles, 1950 accepted as Plaxiphora (Plaxiphora) aurata (Spalowsky, 1795)
- Genus Dinoplax P. P. Carpenter, 1882 (4)
- Genus Helioradsia Thiele, 1893 accepted as Chaetopleura (Pallochiton) Dall, 1879
- Genus Pallochiton Dall, 1879 accepted as Chaetopleura (Pallochiton) Dall, 1879
- Genus Triboplax Thiele, 1893 accepted as Chaetopleura Shuttleworth, 1853
- Family Chitonidae Rafinesque, 1815 (185)
- Family Ischnochitonidae Dall, 1889 (264)
- 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