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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)
- Order Lepidopleurida (307)
- Suborder Cymatochitonina † (25)
- Suborder Lepidopleurina (282)
- Family Abyssochitonidae Dell'Angelo & Palazzi, 1989 (8)
- Family Camptochitonidae Sirenko, 1997 † (11)
- Family Ferreiraellidae Dell'Angelo & Palazzi, 1991 accepted as Abyssochitonidae Dell'Angelo & Palazzi, 1989
- Family Glyptochitonidae Starobogatov & Sirenko, 1975 † (3)
- Family Hanleyidae Bergenhayn, 1955 (10)
- Family Lepidopleuridae Pilsbry, 1892 accepted as Leptochitonidae Dall, 1889
- Family Lepidopleurina incertae sedis † (2)
- Family Leptochitonidae Dall, 1889 (237)
- Subfamily Lepidopleurinae accepted as Leptochitoninae Dall, 1889
- Subfamily Leptochitoninae Dall, 1889 accepted as Leptochitonidae Dall, 1889
- Genus Angulochiton R. D. Hoare, 2001 † (1)
- Genus Asketochiton Hoare & Sabattini, 2000 † (1)
- Genus Belchiton Ashby & Cotton, 1939 † accepted as Leptochiton J. E. Gray, 1847
- Genus Belknapchiton Sirenko, Saito & Schwabe, 2022 (22)
- Genus Colapterochiton R. D. Hoare & R. H. Mapes, 1985 † (1)
- Genus Coryssochiton Debrock, R. D. Hoare & Mapes, 1984 † (1)
- Genus Gifuochiton R.D. Hoare & Karasawa, 2008 † (1)
- Genus Glaphurochiton Raymond, 1910 † (3)
- Genus Hadrochiton Hoare, 2000 † (1)
- Genus Hanleyella Sirenko, 1973 (4)
- Genus Holochiton P. Fischer, 1887 accepted as Leptochiton J. E. Gray, 1847
- Genus Kaasichiton Sirenko, 2024 (4)
- Genus Lepidopleura accepted as Lepidopleurus Risso, 1826
- Genus Lepidopleurus Risso, 1826 (7)
- Subgenus Lepidopleurus (Deshayesiella) P. P. Carpenter, 1879 accepted as Deshayesiella P. P. Carpenter, 1879
- Subgenus Lepidopleurus (Leptochiton) J. E. Gray, 1847 accepted as Leptochiton J. E. Gray, 1847
- Species Lepidopleurus (Leptochiton) agesilaus Dall, 1919 accepted as Leptochiton medinae (Plate, 1899)
- Species Lepidopleurus (Leptochiton) ambustus Dall, 1919 accepted as Leptochiton nexus P. P. Carpenter, 1864
- Species Lepidopleurus (Leptochiton) finlayi Ashby, 1929 accepted as Leptochiton finlayi (Ashby, 1929)
- Species Lepidopleurus (Leptochiton) lycurgus Dall, 1919 accepted as Leptochiton nexus P. P. Carpenter, 1864
- Species Lepidopleurus (Leptochiton) nicomedes Dall, 1919 accepted as Stenosemus exaratus (G. O. Sars, 1878)
- Species Lepidopleurus (Leptochiton) nierstraszi Leloup, 1981 accepted as Leptochiton nierstraszi (Leloup, 1981)
- Species Lepidopleurus (Leptochiton) oldroydi Dall, 1919 accepted as Hanleyella oldroydi (Dall, 1919)
- Subgenus Lepidopleurus (Oldroydia) Dall, 1894 accepted as Oldroydia Dall, 1894
- Subgenus Lepidopleurus (Parachiton) Thiele, 1909 accepted as Parachiton Thiele, 1909
- Subgenus Lepidopleurus (Pilsbryella) Nierstrasz, 1905 accepted as Leptochiton (Pilsbryella) Nierstrasz, 1905
- Subgenus Lepidopleurus (Terenochiton) Iredale, 1914 accepted as Terenochiton Iredale, 1914
- Subgenus Lepidopleurus (Xiphiozona) S. S. Berry, 1919 accepted as Leptochiton J. E. Gray, 1847
- Species Lepidopleurus abbreviatus Dall, 1908 accepted as Belknapchiton halistreptus abbreviatus (Dall, 1908)
- Species Lepidopleurus acuminatus Thiele, 1909 accepted as Parachiton acuminatus (Thiele, 1909)
- Species Lepidopleurus aequispinus Bergenhayn, 1933 accepted as Belknapchiton aequispinus (Bergenhayn, 1933)
- Species Lepidopleurus africanus Nierstrasz, 1906 accepted as Parachiton africanus (Nierstrasz, 1906)
- Species Lepidopleurus alascensis Thiele, 1909 accepted as Leptochiton rugatus (P. P. Carpenter, 1892)
- Species Lepidopleurus algesirensis (Capellini, 1859) accepted as Leptochiton algesirensis (Capellini, 1859)
- Species Lepidopleurus alveolus (Lovén, 1846) accepted as Leptochiton alveolus (Lovén, 1846)
- Species Lepidopleurus ambustus S. S. Berry, 1907 accepted as Leptochiton nexus P. P. Carpenter, 1864
- Species Lepidopleurus andamanicus E. A. Smith, 1906 accepted as Nierstraszella andamanica (E. A. Smith, 1906)
- Species Lepidopleurus arcticus G. O. Sars, 1878 accepted as Leptochiton arcticus (G. O. Sars, 1878)
- Species Lepidopleurus asellus (Gmelin, 1791) accepted as Leptochiton asellus (Gmelin, 1791)
- Species Lepidopleurus assimilis Thiele, 1909 accepted as Leptochiton assimilis (Thiele, 1909)
- Species Lepidopleurus babidus Ashby & Cotton, 1939 † accepted as Leptochiton babidus (Ashby & Cotton, 1939) †
- Species Lepidopleurus badioides Ashby & Cotton, 1939 † accepted as Leptochiton badioides (Ashby & Cotton, 1939) †
- Species Lepidopleurus badius Hedley & Hull, 1909 accepted as Leptochiton badius (Hedley & Hull, 1909)
- Species Lepidopleurus bartletti A. J. Ferreira, 1986 accepted as Ferreiraella bartlettae (A. J. Ferreira, 1986)
- Species Lepidopleurus beanii P. P. Carpenter, 1857 accepted as Cyanoplax beanii (P. P. Carpenter, 1857)
- Species Lepidopleurus belknapioides Leloup, 1981 accepted as Nierstraszella lineata (Nierstrasz, 1905)
- Species Lepidopleurus benoisti (Rochebrune, 1882) †
- Species Lepidopleurus benthedi Leloup, 1981 accepted as Leptochiton benthedi (Leloup, 1981)
- Species Lepidopleurus binghami Boone, 1928 accepted as Leptochiton binghami (Boone, 1928)
- Species Lepidopleurus boettgeri Šulc, 1934 † accepted as Leptochiton boettgeri (Šulc, 1934) †
- Species Lepidopleurus bottae Rochebrune, 1882 accepted as Chiton (Rhyssoplax) affinis Issel, 1869
- Species Lepidopleurus bouryi Rochebrune, 1883 †
- Species Lepidopleurus bullatus P. P. Carpenter, 1857 accepted as Chaetopleura lurida (G. B. Sowerby I, 1832)
- Species Lepidopleurus cajetanus (Poli, 1791)
- Species Lepidopleurus campbelli Filhol, 1880 accepted as Ischnochiton circumvallatus (Reeve, 1847)
- Species Lepidopleurus cancellatus (G. B. Sowerby II, 1840) accepted as Leptochiton cancellatus (G. B. Sowerby II, 1840)
- Species Lepidopleurus carinatus Dall, 1927 accepted as Hanleya hanleyi (W. Bean, 1844)
- Species Lepidopleurus carinatus Leach, 1852 accepted as Lepidochitona (Lepidochitona) cinerea (Linnaeus, 1767)
- Species Lepidopleurus catenatus Hedley & Hull, 1912 accepted as Terenochiton norfolcensis (Hedley & Hull, 1912)
- Species Lepidopleurus chariessa Barnard, 1963 accepted as Leptochiton chariessa (Barnard, 1963)
- Species Lepidopleurus cinereus (Linnaeus, 1767) accepted as Lepidochitona cinerea (Linnaeus, 1767)
- Species Lepidopleurus clifdenensis Ashby, 1929 † accepted as Leptochiton clifdenensis (Ashby, 1929) †
- Species Lepidopleurus columnarius Hedley & May, 1908 accepted as Leptochiton columnarius (Hedley & May, 1908)
- Species Lepidopleurus comptus (A. Gould, 1859) accepted as Ischnochiton comptus (A. Gould, 1859)
- Species Lepidopleurus concharum Rochebrune, 1884 accepted as Lepidozona luzonica (G. B. Sowerby II, 1842)
- Species Lepidopleurus corallinus Risso, 1826 accepted as Rhyssoplax corallina (Risso, 1826)
- Species Lepidopleurus corrosus Rochebrune, 1884 accepted as Ischnochiton striolatus (J. E. Gray, 1828)
- Species Lepidopleurus culliereti Rochebrune, 1889
- Species Lepidopleurus cygneus Iredale & Hull, 1924 accepted as Ischnochiton arbutum (Reeve, 1847)
- Species Lepidopleurus dallii Haddon, 1886 accepted as Stenosemus exaratus (G. O. Sars, 1878)
- Species Lepidopleurus daubrei Rochebrune, 1882 †
- Species Lepidopleurus diomedeae S. S. Berry, 1917 accepted as Nierstraszella lineata (Nierstrasz, 1905)
- Species Lepidopleurus diversigranosus Ashby & Cotton, 1939 † accepted as Leptochiton diversigranosus (Ashby & Cotton, 1939) †
- Species Lepidopleurus dorsuosus Haddon, 1886 accepted as Stenosemus exaratus (G. O. Sars, 1878)
- Species Lepidopleurus ectypus Rochebrune, 1884 accepted as Chiton (Rhyssoplax) ectypus (Rochebrune, 1884)
- Species Lepidopleurus farallonis Dall, 1902 accepted as Leptochiton belknapi Dall, 1878
- Species Lepidopleurus finlayi Ashby, 1929 accepted as Leptochiton finlayi (Ashby, 1929)
- Species Lepidopleurus fischeri Rochebrune, 1883 † accepted as Leptochiton fischeri (Rochebrune, 1883) †
- Species Lepidopleurus fodiatus Rochebrune, 1881 accepted as Ischnochiton textilis (J. E. Gray, 1828)
- Species Lepidopleurus fuscopunctatus Leloup, 1961 accepted as Ischnochiton dispar (G. B. Sowerby I, 1832)
- Species Lepidopleurus gallicus Dell'Angelo, Landau, Van Dingenen & Ceulemans, 2018 †
- Species Lepidopleurus giganteus Nierstrasz, 1905 accepted as Belknapchiton giganteus (Nierstrasz, 1905)
- Species Lepidopleurus glauerti Ashby, 1929 accepted as Leptochiton badius (Hedley & Hull, 1909)
- Species Lepidopleurus granoliratus P. P. Carpenter, 1892 accepted as Leptochiton algesirensis (Capellini, 1859)
- Species Lepidopleurus hakodatensis Thiele, 1909 accepted as Leptochiton hakodatensis (Thiele, 1909)
- Species Lepidopleurus halistreptus Dall, 1902 accepted as Belknapchiton halistreptus (Dall, 1902)
- Species Lepidopleurus heathi (S. S. Berry, 1919) accepted as Leptochiton nexus P. P. Carpenter, 1864
- Species Lepidopleurus hirasei Is. Taki & Iw. Taki, 1929 accepted as Leptochiton hirasei (Is. Taki & Iw. Taki, 1929)
- Species Lepidopleurus incongruus Dall, 1908 accepted as Leptochiton incongruus (Dall, 1908)
- Species Lepidopleurus inquinatus (Reeve, 1847) accepted as Leptochiton inquinatus (Reeve, 1847)
- Species Lepidopleurus intermedius Salvini-Plawen, 1968 accepted as Leptochiton intermedius (Salvini-Plawen, 1968)
- Species Lepidopleurus internexus Pilsbry, 1892 accepted as Leptochiton rugatus (P. P. Carpenter, 1892)
- Species Lepidopleurus iredalei Ashby, 1921 accepted as Leptochiton inquinatus (Reeve, 1847)
- Species Lepidopleurus japonicus Thiele, 1909 accepted as Belknapchiton japonicus (Thiele, 1909)
- Species Lepidopleurus juvenis Leloup, 1981 accepted as Leptochiton juvenis (Leloup, 1981)
- Species Lepidopleurus kerguelensis (Haddon, 1886) accepted as Leptochiton kerguelensis Haddon, 1886
- Species Lepidopleurus laterodepressus Bergenhayn, 1945 † accepted as Proleptochiton laterodepressus (Bergenhayn, 1945) †
- Species Lepidopleurus latidens Bergenhayn, 1933 accepted as Leptochiton latidens (Bergenhayn, 1933)
- Species Lepidopleurus lineatus Nierstrasz, 1905 accepted as Nierstraszella lineata (Nierstrasz, 1905)
- Species Lepidopleurus liratus H. Adams & Angas, 1864 accepted as Leptochiton liratus (H. Adams & Angas, 1864)
- Species Lepidopleurus luridus Dall, 1902 accepted as Leptochiton luridus (Dall, 1902)
- Species Lepidopleurus macandrei P. P. Carpenter, 1857 accepted as Ischnochiton muscarius (Reeve, 1847)
- Species Lepidopleurus magnogranifer Ashby, 1925 † accepted as Leptochiton magnogranifer (Ashby, 1925) †
- Species Lepidopleurus maguntiacus Rochebrune, 1883 accepted as Leptochiton algesirensis (Capellini, 1859)
- Species Lepidopleurus matthewsianus Bednall, 1906 accepted as Leptochiton matthewsianus (Bednall, 1906)
- Species Lepidopleurus medinae Plate, 1899 accepted as Leptochiton medinae (Plate, 1899)
- Species Lepidopleurus melanterus Rochebrune, 1884 accepted as Ischnochiton circumvallatus (Reeve, 1847)
- Species Lepidopleurus meneghinii Capellini, 1859 accepted as Ischnochiton rissoi (Payraudeau, 1826)
- Species Lepidopleurus mesogonus Dall, 1902 accepted as Leptochiton belknapi Dall, 1878
- Species Lepidopleurus mestayerae (Iredale, 1914) accepted as Parachiton eugenei (Kaas & Van Belle, 1985)
- Species Lepidopleurus morleti Rochebrune, 1883 †
- Species Lepidopleurus niasicus Thiele, 1906 accepted as Nierstraszella lineata (Nierstrasz, 1905)
- Species Lepidopleurus nicomedes Dall, 1919 accepted as Stenosemus exaratus (G. O. Sars, 1878)
- Species Lepidopleurus niger Torr, 1911 accepted as Leptochiton matthewsianus (Bednall, 1906)
- Species Lepidopleurus nivarus Ashby & Cotton, 1939 † accepted as Leptochiton nivarus (Ashby & Cotton, 1939) †
- Species Lepidopleurus noemiae Rochebrune, 1884 accepted as Onithochiton noemiae (Rochebrune, 1884)
- Species Lepidopleurus norfolcensis Hedley & Hull, 1912 accepted as Terenochiton norfolcensis (Hedley & Hull, 1912)
- Species Lepidopleurus odhneri Bergenhayn, 1931 accepted as Leptochiton odhneri (Bergenhayn, 1931)
- Species Lepidopleurus oldroydi Dall, 1919 accepted as Hanleyella oldroydi (Dall, 1919)
- Species Lepidopleurus opacus Dall, 1908 accepted as Leptochiton belknapi Dall, 1878
- Species Lepidopleurus pamphilius Ashby & Cotton, 1939 † accepted as Protochiton granulosus (Ashby & Torr, 1901) †
- Species Lepidopleurus pectinulatus P. P. Carpenter, 1893 accepted as Lepidozona pectinulata (P. P. Carpenter, 1893)
- Species Lepidopleurus pelagicus Torr, 1912 accepted as Leptochiton columnarius (Hedley & May, 1908)
- Species Lepidopleurus percrassa Dall, 1894 accepted as Oldroydia percrassa (Dall, 1894)
- Species Lepidopleurus philippinus Leloup, 1981 accepted as Nierstraszella andamanica (E. A. Smith, 1906)
- Species Lepidopleurus planus Nierstrasz, 1905 accepted as Ferreiraella plana (Nierstrasz, 1905)
- Species Lepidopleurus poirieri Rochebrune, 1882 † accepted as Leptochiton poirieri (Rochebrune, 1882) †
- Species Lepidopleurus porosus Leloup, 1981 accepted as Nierstraszella andamanica (E. A. Smith, 1906)
- Species Lepidopleurus profundus Ashby, 1923 accepted as Leptochiton collusor (Iredale & Hull, 1925)
- Species Lepidopleurus profundus May, 1923 accepted as Leptochiton liratus (H. Adams & Angas, 1864)
- Species Lepidopleurus pseudobenoisti Dell'Angelo, Landau, Van Dingenen & Ceulemans, 2018 †
- Species Lepidopleurus punctulatus Leach, 1852 accepted as Callochiton septemvalvis septemvalvis (Montagu, 1803)
- Species Lepidopleurus relatus Ashby & Cotton, 1939 † accepted as Leptochiton magnogranifer (Ashby, 1925) †
- Species Lepidopleurus rissoi Nierstrasz, 1905 accepted as Leptochiton rissoi (Nierstrasz, 1905)
- Species Lepidopleurus rochebruni Jousseaume, 1894 accepted as Callistochiton adenensis (E. A. Smith, 1891)
- Species Lepidopleurus rugatus P. P. Carpenter, 1892 accepted as Leptochiton rugatus (P. P. Carpenter, 1892)
- Species Lepidopleurus scabridus (Jeffreys, 1880) accepted as Leptochiton scabridus (Jeffreys, 1880)
- Species Lepidopleurus scrippsianus A. J. Ferreira, 1980 accepted as Ferreiraella scrippsiana (A. J. Ferreira, 1980)
- Species Lepidopleurus sephus Ashby & Cotton, 1939 † accepted as Leptochiton sephus (Ashby & Cotton, 1939) †
- Species Lepidopleurus similis E. A. Smith, 1894 accepted as Belknapchiton similis (E. A. Smith, 1894)
- Species Lepidopleurus simplex Nierstrasz, 1905 accepted as Belknapchiton simplex (Nierstrasz, 1905)
- Species Lepidopleurus sinervus Ashby & Cotton, 1939 † accepted as Leptochiton sinervus (Ashby & Cotton, 1939) †
- Species Lepidopleurus singus Ashby & Cotton, 1939 † accepted as Leptochiton singus (Ashby & Cotton, 1939) †
- Species Lepidopleurus soyomaruae S.-K. Wu & Okutani, 1984 accepted as Ferreiraella soyomaruae (S.-K. Wu & Okutani, 1984)
- Species Lepidopleurus speciosus H. Adams & Angas, 1864 accepted as Ischnochiton contractus (Reeve, 1847)
- Species Lepidopleurus srameki Šulc, 1934 † accepted as Leptochiton boettgeri (Šulc, 1934) †
- Species Lepidopleurus sulcatus Risso, 1826 accepted as Chiton (Rhyssoplax) olivaceus Spengler, 1797
- Species Lepidopleurus sulci Bałuk, 1971 † accepted as Leptochiton cancellatus (G. B. Sowerby II, 1840)
- Species Lepidopleurus sykesi (G. B. Sowerby III, 1903) accepted as Leptochiton sykesi (G. B. Sowerby III, 1903)
- Species Lepidopleurus takii S.-K. Wu & Okutani, 1984 accepted as Ferreiraella takii (S.-K. Wu & Okutani, 1984)
- Species Lepidopleurus thielei Sulc, 1934 † accepted as Leptochiton africanus (Nierstrasz, 1906)
- Species Lepidopleurus uxellus Ashby & Cotton, 1939 † accepted as Leptochiton uxellus (Ashby & Cotton, 1939) †
- Species Lepidopleurus variegatus H. Adams & Angas, 1864 accepted as Ischnochiton variegatus (H. Adams & Angas, 1864)
- Species Lepidopleurus virgifer (F. Sandberger, 1859) †
- Species Lepidopleurus vitjazi Sirenko, 1977 accepted as Leptochiton vitjazae (Sirenko, 1977)
- Genus Leptochiton J. E. Gray, 1847 (147)
- Genus Molachiton Ashby & Cotton, 1939 †
- Genus Parachiton Thiele, 1909 (24)
- Genus Platychiton R. D. Hoare, 2001 † (2)
- Genus Proleptochiton Sirenko & Starobogatov, 1977 † (1)
- Genus Pseudoischnochiton Ashby, 1929 † (1)
- Genus Pterochiton Carpenter, 1882 † (11)
- Genus Schematochiton R. D. Hoare, 2002 † (1)
- Genus Systenochiton R. D. Hoare, 2001 † (1)
- Genus Terenochiton Iredale, 1914 (2)
- Genus Trachypleura Jaekel, 1900 † (1)
- Family Mesochitonidae Dell'Angelo & Palazzi, 1989 † (2)
- Family Nierstraszellidae Sirenko, 1992 (2)
- Family Protochitonidae Ashby, 1925 (7)
- Family Xylochitonidae Gowlett-Holmes & A. M. Jones, 1992 accepted as Abyssochitonidae Dell'Angelo & Palazzi, 1989
- 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