Between brackets is the number of accepted species

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- Mollusca (132 927)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 030)
- Class Caudofoveata (143)
- Class Cephalopoda (1 845)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 801)
- Subclass Amphigastropoda † (404)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 703)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 177)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 783)
- Order Anisobranchia accepted as Trochidae Rafinesque, 1815
- Order Cocculinida (69)
- Order Lepetellida (1 205)
- Order Neomphalida (63)
- Order Pleurotomariida (695)
- Superfamily Eotomarioidea Wenz, 1938 † accepted as Porcellioidea Zittel, 1895 †
- Superfamily Murchisonioidea Koken, 1896 † (33)
- Superfamily Pleurotomariacea Swainson, 1840 accepted as Pleurotomarioidea Swainson, 1840
- Superfamily Pleurotomarioidea Swainson, 1840 (271)
- Superfamily Porcellioidea Zittel, 1895 † (170)
- Superfamily Pseudophoroidea S. A. Miller, 1889 † (23)
- Superfamily Ptychomphaloidea Wenz, 1938 † (115)
- Family Ptychomphalidae Wenz, 1938 † (8)
- Family Rhaphistomellidae Bandel, 2009 † (8)
- Family Temnotropidae L. R. Cox, 1960 † (1)
- Family Trochotomidae L. R. Cox, 1960 † (98)
- Genus Didymodon P. Fischer, 1885 † accepted as Valfinia L. R. Cox, 1958 †
- Genus Discotoma Wenz, 1938 † accepted as Placotoma Ferrari, Damborenea, Manceñido & Griffin, 2015 †
- Genus Ditremaria A. d'Orbigny, 1843 † accepted as Trochotoma J. A. Eudes-Deslongchamps, 1843 †
- Genus Kericserispira J. Szabó, 2018 † (1)
- Genus Legayella J.-C. Fischer, 1969 † (3)
- Genus Placostoma [sic] † accepted as Placotoma Ferrari, Damborenea, Manceñido & Griffin, 2015 †
- Genus Placotoma Ferrari, Damborenea, Manceñido & Griffin, 2015 † (17)
- Genus Trochotoma J. A. Eudes-Deslongchamps, 1843 † (58)
- Subgenus Trochotoma (Didymodon) P. Fischer, 1885 † accepted as Valfinia L. R. Cox, 1958 †
- Subgenus Trochotoma (Discotoma) Wenz, 1938 † accepted as Placotoma Ferrari, Damborenea, Manceñido & Griffin, 2015 †
- Subgenus Trochotoma (Legayella) J.-C. Fischer, 1969 † accepted as Legayella J.-C. Fischer, 1969 †
- Subgenus Trochotoma (Placotoma) Ferrari, Damborenea, Manceñido & Griffin, 2015 † accepted as Placotoma Ferrari, Damborenea, Manceñido & Griffin, 2015 †
- Species Trochotoma (Placotoma) amata (A. d'Orbigny, 1850) † accepted as Placotoma amata (A. d'Orbigny, 1850) †
- Species Trochotoma (Placotoma) barremica Cossmann, 1916 † accepted as Placotoma barremica (Cossmann, 1916) †
- Species Trochotoma (Placotoma) cossmanni (Rollier, 1918) † accepted as Placotoma cossmanni (Rollier, 1918) †
- Species Trochotoma (Placotoma) depressa (Gioli, 1889) † accepted as Placotoma depressa (Gioli, 1889) †
- Species Trochotoma (Placotoma) depressiuscula (Lycett, 1850) † accepted as Placotoma depressiuscula (Lycett, 1850) †
- Species Trochotoma (Placotoma) discoidea Buvignier, 1852 † accepted as Placotoma discoidea (Buvignier, 1852) †
- Species Trochotoma (Placotoma) funiculosa (Cossmann, 1885) † accepted as Placotoma funiculosa (Cossmann, 1885) †
- Species Trochotoma (Placotoma) multicincta (Zieten, 1832) † accepted as Placotoma multicincta (Zieten, 1832) †
- Species Trochotoma (Placotoma) multipleura (H.-Z. Pan, 1977) † accepted as Placotoma multipleura (H.-Z. Pan, 1977) †
- Species Trochotoma (Placotoma) neuquensis Ferrari, Damborenea, Manceñido & Griffin, 2015 † accepted as Placotoma neuquensis (Ferrari, Damborenea, Manceñido & Griffin, 2015) †
- Species Trochotoma (Placotoma) petrariae (Bigot, 1935) † accepted as Placotoma petrariae (Bigot, 1935) †
- Species Trochotoma (Placotoma) planoconvexa (W. Yu, H.-Z. Pan & H.-J. Wang, 1974) † accepted as Placotoma planoconvexa (W. Yu, H.-Z. Pan & H.-J. Wang, 1974) †
- Species Trochotoma (Placotoma) rota (J. A. Eudes-Deslongchamps, 1843) † accepted as Placotoma rota (J. A. Eudes-Deslongchamps, 1843) †
- Species Trochotoma (Placotoma) solarium (F. C. L. Koch, 1848) † accepted as Placotoma solarium (F. C. L. Koch, 1848) †
- Species Trochotoma (Placotoma) tornatilis (J. Phillips, 1829) † accepted as Placotoma tornatilis (J. Phillips, 1829) †
- Species Trochotoma (Placotoma) yunnanensis (H.-Z. Pan, 1977) † accepted as Placotoma yunnanensis (H.-Z. Pan, 1977) †
- Subgenus Trochotoma (Trochotoma) J. A. Eudes-Deslongchamps, 1843 † represented as Trochotoma J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma acuminata J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma affinis J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma amata (A. d'Orbigny, 1850) † accepted as Placotoma amata (A. d'Orbigny, 1850) †
- Species Trochotoma angulata (Münster, 1844) †
- Species Trochotoma auris Zittel, 1873 †
- Species Trochotoma barremica Cossmann, 1916 † accepted as Placotoma barremica (Cossmann, 1916) †
- Species Trochotoma bicarinata (A. d'Orbigny, 1843) †
- Species Trochotoma brocastellensis C. Moore, 1867 †
- Species Trochotoma calix (J. Phillips, 1829) †
- Species Trochotoma canaliculata [sic] † accepted as Trochotoma carinata Lycett, 1850 †
- Species Trochotoma carinata Lycett, 1850 † accepted as Trochotoma affinis J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma carpatica Kochanová, 1973 †
- Species Trochotoma chanoisi Henry, 1875 †
- Species Trochotoma clypeus Terquem, 1855 †
- Species Trochotoma conuloides J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma crossei de Folin, 1869 accepted as Sinezona cingulata (O. G. Costa, 1861)
- Species Trochotoma depressiuscula Lycett, 1850 † accepted as Placotoma depressiuscula (Lycett, 1850) †
- Species Trochotoma desoriana (Cotteau, 1854) †
- Species Trochotoma discoidea Buvignier, 1852 † accepted as Placotoma discoidea (Buvignier, 1852) †
- Species Trochotoma discoidea (F. Roemer, 1836) †
- Species Trochotoma distefanoi Fucini, 1913 †
- Species Trochotoma elegans Gemmellaro, 1889 †
- Species Trochotoma extensa J. Morris & Lycett, 1851 †
- Species Trochotoma fallax (Kittl, 1891) †
- Species Trochotoma fistulata Sachariewa-Kowatschewa, 1962 †
- Species Trochotoma frydai (Kiel & Bandel, 2000) †
- Species Trochotoma funata Lycett, 1850 †
- Species Trochotoma funiculosa Cossmann, 1885 † accepted as Placotoma funiculosa (Cossmann, 1885) †
- Species Trochotoma gabulongense Y.-T. Pan, 1978 †
- Species Trochotoma gansuensis Tong & Erwin, 2001 †
- Species Trochotoma gemmellaroi (Haber, 1934) †
- Species Trochotoma gigantea Zittel, 1873 †
- Species Trochotoma globulus J. A. Eudes-Deslongchamps, 1843 † accepted as Valfinia globulus (J. A. Eudes-Deslongchamps, 1843) †
- Species Trochotoma gradata (Gemmellaro, 1879) †
- Species Trochotoma gradus J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma haueri M. Hörnes, 1853 †
- Species Trochotoma hermitei Gemmellaro, 1879 †
- Species Trochotoma hudlestoni (Rollier, 1918) †
- Species Trochotoma humbertina Buvignier, 1852 † accepted as Valfinia humbertina (Buvignier, 1852) †
- Species Trochotoma imbricata Cossmann, 1885 †
- Species Trochotoma infundibulum (Étallon, 1862) †
- Species Trochotoma ingens (Rollier, 1918) †
- Species Trochotoma kimmeridgiensis Maire, 1927 † accepted as Legayella kimmeridgiensis (Maire, 1927) †
- Species Trochotoma laevigata Piette, 1855 † accepted as Crossostoma nudum (Piette, 1855) †
- Species Trochotoma lamberti de Loriol, 1893 †
- Species Trochotoma legayi Cossmann, 1885 † accepted as Legayella legayi (Cossmann, 1885) †
- Species Trochotoma lindonensis Hudleston, 1896 † accepted as Valfinia lindonensis (Hudleston, 1896) †
- Species Trochotoma lorioli Cossmann, 1902 † accepted as Valfinia lorioli (Cossmann, 1902) †
- Species Trochotoma lycetti Hermite, 1877 † accepted as Trochotoma (Trochotoma) obtusa J. Morris & Lycett, 1851 †
- Species Trochotoma lycetti C. Moore, 1867 †
- Species Trochotoma magnifica Cossmann, 1885 †
- Species Trochotoma mantochensis (Étallon, 1864) †
- Species Trochotoma marbachensis Hermite, 1877 † accepted as Valfinia marbachensis (Hermite, 1877) †
- Species Trochotoma mastoidea (Étallon, 1861) †
- Species Trochotoma maubertense Terquem & Piette, 1865 † accepted as Trochotoma maubertensis Terquem & Piette, 1865 †
- Species Trochotoma maubertensis Terquem & Piette, 1865 †
- Species Trochotoma meneghinii Gemmellaro, 1879 †
- Species Trochotoma morieri E. Eudes-Deslongchamps, 1864 † accepted as Trochotoma pachyspira E. Eudes-Deslongchamps, 1868 †
- Species Trochotoma nucleus (Terquem, 1855) †
- Species Trochotoma obtusa J. Morris & Lycett, 1851 †
- Species Trochotoma orbita H.-Z. Pan, 1982 †
- Species Trochotoma orientalis (Kiparisova, 1952) †
- Species Trochotoma pachyspira E. Eudes-Deslongchamps, 1868 †
- Species Trochotoma petrariae Bigot, 1935 † accepted as Placotoma petrariae (Bigot, 1935) †
- Species Trochotoma picteti Zittel, 1873 †
- Species Trochotoma praecursor (Stoppani, 1861) †
- Species Trochotoma prisca Gemmellaro, 1889 †
- Species Trochotoma protonotialis Ferrari, Damborenea, Manceñido & Griffin, 2015 †
- Species Trochotoma putealis Cossmann, 1885 †
- Species Trochotoma quenstedti (Rollier, 1918) †
- Species Trochotoma ranvilliana (Rollier, 1918) †
- Species Trochotoma rathieriana (A. d'Orbigny, 1850) †
- Species Trochotoma rota J. A. Eudes-Deslongchamps, 1843 † accepted as Placotoma rota (J. A. Eudes-Deslongchamps, 1843) †
- Species Trochotoma scalaris (A. d'Orbigny, 1850) †
- Species Trochotoma scansilis (Ammon, 1893) †
- Species Trochotoma schlumbergeri E. Eudes-Deslongchamps, 1868 † accepted as Trochotoma affinis J. A. Eudes-Deslongchamps, 1843 †
- Species Trochotoma secans (Dubar, 1948) †
- Species Trochotoma somertonensis (Rollier, 1918) †
- Species Trochotoma striata (Zittel, 1873) †
- Species Trochotoma striata M. Hörnes, 1853 †
- Species Trochotoma suevica (Quenstedt, 1884) † accepted as Placotoma suevica (Quenstedt, 1884) †
- Species Trochotoma tabulata J. Morris & Lycett, 1851 †
- Species Trochotoma terquemi Deshayes, 1865 † accepted as Sinezona terquemi (Deshayes, 1865) †
- Species Trochotoma tethys (A. d'Orbigny, 1850) †
- Species Trochotoma trocheata (Terquem, 1855) †
- Species Trochotoma trochoides (Gemmellaro, 1879) †
- Species Trochotoma vetusta Terquem, 1855 †
- Genus Urkutitoma J. Szabó, 1984 † (1)
- Genus Valfinia L. R. Cox, 1958 † (18)
- Superfamily Schizogonioidea L. R. Cox, 1960 † (74)
- Superfamily Sinuspiroidea Mazaev, 2011 † (9)
- Superfamily Worthenielloidea Bandel, 2009 † accepted as Schizogonioidea L. R. Cox, 1960 †
- Order Seguenziida (923)
- Order Trochida (3 800)
- Superfamily Fissurellacea accepted as Fissurelloidea J. Fleming, 1822
- Superfamily Trochacea accepted as Trochoidea Rafinesque, 1815
- Superfamily Turbinoidea Rafinesque, 1815 accepted as Trochoidea Rafinesque, 1815
- Superfamily Vetigastropoda incertae sedis (28)
- 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)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata