Between brackets is the number of accepted species

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- Mollusca (133 295)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 040)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 850)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 722)
- Order Littorinimorpha (17 232)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (220)
- Superfamily Cassoidea accepted as Tonnoidea Suter, 1913 (1825)
- Superfamily Cingulopsoidea Fretter & Patil, 1958 (193)
- Superfamily Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809
- Superfamily Cypraeoidea Rafinesque, 1815 (1 299)
- Superfamily Eulimoidea R. A. Philippi, 1853 accepted as Vanikoroidea Gray, 1840
- Superfamily Ficoidea Meek, 1864 (1840) (71)
- Superfamily Heteropoda Lamarck, 1812 accepted as Pterotracheoidea Rafinesque, 1814
- Superfamily Hipponicoidea Troschel, 1861 (99)
- Superfamily Littorinoidea Children, 1834 (1 372)
- Superfamily Naticoidea Guilding, 1834 (689)
- Superfamily Pterotracheoidea Rafinesque, 1814 (63)
- Superfamily Rissoacea accepted as Rissooidea Gray, 1847
- Superfamily Rissoinoidea W. Stimpson, 1865 accepted as Rissooidea Gray, 1847
- Superfamily Rissooidea Gray, 1847 (2 311)
- Superfamily Stromboidea Rafinesque, 1815 (839)
- Superfamily Tonnoidea Suter, 1913 (1825) (787)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 935)
- Family Adeorbidae Monterosato, 1884 accepted as Tornidae Sacco, 1896 (1884)
- Family Amnicolidae Tryon, 1863 (132)
- Family Anabathridae Keen, 1971 (152)
- Family Ascorhiidae Ponder, Nimbs & Shea, 2023 (2)
- Family Assimineidae H. Adams & A. Adams, 1856 (428)
- Family Baicaliidae P. Fischer, 1885 (59)
- Family Beddomeiidae Ponder, Nimbs & Shea, 2023 (58)
- Family Benedictiidae Clessin, 1880 accepted as Benedictiinae Clessin, 1880
- Family Bithyniidae J. E. Gray, 1857 (367)
- Family Bythinellidae Locard, 1893 (213)
- Family Caecidae J. E. Gray, 1850 (287)
- Family Caledoniellidae Rosewater, 1969 (6)
- Family Calopiidae Ponder, 1999 (3)
- Family Circulidae Fretter & Graham, 1962 accepted as Vitrinellidae K. J. Bush, 1897
- Family Clenchiellidae D. W. Taylor, 1966 (14)
- Family Cochliopidae Tryon, 1866 (414)
- Family Coxiellidae Iredale, 1943 accepted as Tomichiidae Wenz, 1938
- Family Ctiloceratidae Iredale & Laseron, 1957 accepted as Ctiloceratinae Iredale & Laseron, 1957
- Family Cyclotropidae Iredale, 1941 accepted as Ekadantinae Thiele, 1929
- Family Elachisinidae Ponder, 1985 (71)
- Family Emmericiidae Brusina, 1870 (46)
- Family Epigridae Ponder, 1985 (4)
- Family Erhaiidae G. M. Davis & Y.-H. Kuo, 1985 (36)
- Family Fairbankiinae Thiele, 1928 accepted as Iravadiidae Thiele, 1928
- Family Falsicingulidae Slavoshevskaya, 1975 (5)
- Family Fontigentidae D. W. Taylor, 1966 (16)
- Family Helicostoidae Pruvot-Fol, 1937 accepted as Helicostoinae Pruvot-Fol, 1937
- Family Hyalidae A. N. Golikov & Starobogatov, 1975 accepted as Iravadiidae Thiele, 1928
- Family Hydrobiidae W. Stimpson, 1865 (2 115)
- Family Hydrococcidae Thiele, 1928 (1)
- Family Iravadiidae Thiele, 1928 (140)
- Family Kolhymamnicolidae Starobogatov, 1983 accepted as Amnicolinae Tryon, 1863
- Family Limnoreidae B. Dybowski, 1911 accepted as Baicaliidae P. Fischer, 1885
- Family Lithoglyphidae Tryon, 1866 (174)
- Family Lithoglyphulidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
- Family Litthabitellidae Falniowski & Hofman, 2023 (4)
- Family Mesocochliopidae X.-H. Yu, 1987 † (6)
- Family Micromelaniidae B. Dybowski & Grochmalicki, 1913 accepted as Pyrgulinae Brusina, 1882
- Family Micropyrgulidae Radoman, 1973 accepted as Pyrgulinae Brusina, 1882
- Family Moitessieriidae Bourguignat, 1864 (315)
- Genus Atebbania Ghamizi, Bodon, Boulal & Fo. Giusti, 1999 (1)
- Genus Baldufa Alba, Tarruella, Prats, Guillen & Corbella, 2010 (1)
- Genus Bosnidilhia Boeters, Glöer & Pešić, 2013 (2)
- Genus Bythiospeum Bourguignat, 1882 (88)
- Genus Clameia Boeters & E. Gittenberger, 1990 (1)
- Genus Corseria Boeters & Falkner, 2009 (1)
- Genus Costellina Kuščer, 1933 accepted as Paladilhiopsis (Costellina) Kuščer, 1933
- Genus Henrigirardia Boeters & Falkner, 2003 (1)
- Genus Iglica A. J. Wagner, 1928 (33)
- Subgenus Iglica (Iglica) A. J. Wagner, 1928 represented as Iglica A. J. Wagner, 1928
- Species Iglica (Iglica) acicularis Angelov, 1959 represented as Iglica acicularis Angelov, 1959
- Species Iglica (Iglica) concii Allegretti, 1944 accepted as Iglica concii Allegretti, 1944
- Species Iglica (Iglica) elongata Kuščer, 1933 represented as Iglica elongata Kuščer, 1933
- Species Iglica (Iglica) forumjuliana (Pollonera, 1887) accepted as Iglica forumjuliana (Pollonera, 1887)
- Species Iglica (Iglica) giustii Bodon & Giovanelli, 1995 represented as Iglica giustii Bodon & Giovannelli, 1995
- Species Iglica (Iglica) gracilis (Clessin, 1882) accepted as Iglica gracilis (Clessin, 1882)
- Species Iglica (Iglica) gratulabunda (A. J. Wagner, 1910) represented as Iglica gratulabunda (A. J. Wagner, 1910)
- Species Iglica (Iglica) hauffeni (Brusina, 1886) accepted as Iglica hauffeni (Brusina, 1886)
- Species Iglica (Iglica) kleinzellensis P. L. Reischütz, 1981 represented as Iglica kleinzellensis P. L. Reischütz, 1981
- Species Iglica (Iglica) langhofferi A. J. Wagner, 1928 represented as Iglica langhofferi A. J. Wagner, 1928
- Species Iglica (Iglica) luxurians (Kuščer, 1932) represented as Iglica luxurians (Kuščer, 1932)
- Species Iglica (Iglica) pezzolii Boeters, 1971 represented as Iglica pezzolii Boeters, 1971
- Species Iglica (Iglica) relicta (Kuščer, 1937)
- Species Iglica (Iglica) tellinii (Pollonera, 1886) represented as Iglica tellinii (Pollonera, 1886)
- Species Iglica (Iglica) velkovrhi De Mattia, 2007 represented as Iglica velkovrhi De Mattia, 2007
- Species Iglica (Iglica) vobarnensis (Pezzoli & Toffoletto, 1968) accepted as Iglica vobarnensis (Pezzoli & Toffoletto, 1968)
- Species Iglica (Iglica) wofischeri A. Reischütz & P. L. Reischütz, 2004 represented as Iglica wofischeri A. Reischutz & P. L. Reischutz, 2004
- Subgenus Iglica (Mervicia) Bole, 1967 represented as Iglica A. J. Wagner, 1928
- Subgenus Iglica (Rhaphica) Schütt, 1975 represented as Iglica A. J. Wagner, 1928
- Species Iglica absoloni (A. J. Wagner, 1914) accepted as Paladilhiopsis absoloni (A. J. Wagner, 1914)
- Species Iglica acicularis Angelov, 1959
- Species Iglica alpheus A. Reischütz & P. L. Reischütz, 2004
- Species Iglica bagliviaeformis Schütt, 1970
- Species Iglica bosnica Schütt, 1975
- Species Iglica calepii Niero & Pezzoli, 2016
- Species Iglica concii Allegretti, 1944
- Species Iglica elongata Kuščer, 1933
- Species Iglica eximia Bole, 1967
- Species Iglica forumjuliana (Pollonera, 1887)
- Species Iglica gittenbergeri A. Reischütz & P. L. Reischütz, 2008 accepted as Paladilhiopsis gittenbergeri (A. Reischütz & P. L. Reischütz, 2008)
- Species Iglica giustii Bodon & Giovannelli, 1995
- Species Iglica gracilis (Clessin, 1882)
- Species Iglica gratulabunda (A. J. Wagner, 1910)
- Species Iglica hauffeni (Brusina, 1886)
- Species Iglica hellenica Falniowski & Sarbu, 2015
- Species Iglica hungarica (Soós, 1927)
- Species Iglica illyrica Schütt, 1975
- Species Iglica kanalitensis A. Reischütz, N. Steiner-Reischütz & P. L. Reischütz, 2016
- Species Iglica karamani (Kuščer, 1937)
- Species Iglica kirea (Boeters, 1991)
- Species Iglica kleinzellensis P. L. Reischütz, 1981
- Species Iglica langhofferi A. J. Wagner, 1928
- Species Iglica luxurians (Kuščer, 1932)
- Species Iglica maasseni Schütt, 1980
- Species Iglica matjasici Bole, 1961 accepted as Anagastina matjasici (Bole, 1961)
- Species Iglica pezzolii Boeters, 1971
- Species Iglica relicta (Kuščer, 1937)
- Species Iglica seyadi Backhuys & Boeters, 1974
- Species Iglica sidarensis Schütt, 1980
- Species Iglica soussensis Ghamizi & Boulal, 2017
- Species Iglica tellinii (Pollonera, 1886)
- Species Iglica velkovrhi De Mattia, 2007
- Species Iglica vobarnensis (Pezzoli & Toffoletto, 1968)
- Species Iglica wofischeri A. Reischutz & P. L. Reischutz, 2004
- Species Iglica xhuxhi A. Reischütz, N. Reischütz & P. L. Reischütz, 2014
- Genus Lanzaia Brusina, 1906 (10)
- Genus Lanzaiopsis Bole, 1989 (1)
- Genus Mervicia Bole, 1967 accepted as Iglica (Mervicia) Bole, 1967
- Genus Moitessieria Bourguignat, 1864 (47)
- Genus Paladilhia Bourguignat, 1865 (14)
- Genus Paladilhiopsis Pavlović, 1913 (36)
- Genus Palaospeum Boeters, 1999 (6)
- Genus Plagigeyeria Tomlin, 1930 (32)
- Genus Sardopaladilhia Manganelli, Bodon, Cianfanelli, Talenti & Fo. Giusti, 1998 (5)
- Genus Saxurinator Schütt, 1960 (8)
- Genus Sorholia Boeters & Falkner, 2009 (1)
- Genus Spiralix Boeters, 1972 (24)
- Genus Tarracospeum Quiñonero-Salgado, Ruiz-Jarillo, Á. Alonso & Rolán, 2021 (1)
- Genus Trogloiranica Fatemi, Malek-Hosseini, Falniowski, Hofman, Kuntner & Grego, 2019 (1)
- Genus Vitrella Clessin, 1877 accepted as Bythiospeum Bourguignat, 1882 (1)
- Family Orientaliidae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
- Family Orientalinidae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966
- Family Palaeobaicaliidae Sitnikova & Vinarski, 2023 † (13)
- Family Paludestrinidae R. B. Newton, 1891 accepted as Eatoniellidae Ponder, 1965
- Family Paludinellidae T. Habe, 1976 accepted as Ekadantinae Thiele, 1929
- Family Pomatiopsidae W. Stimpson, 1865 (285)
- Family Potamopyrgidae F. C. Baker, 1928 accepted as Tateidae Thiele, 1925
- Family Pseudomerelininae Starobogatov, 1989 accepted as Iravadiidae Thiele, 1928
- Family Pyrgulidae Brusina, 1882 (1869) accepted as Hydrobiidae W. Stimpson, 1865
- Family Spirostyliferinidae Layton, Middelfart, Tatarnic & N. G. Wilson, 2019 (2)
- Family Squamapicidae L.-J. Zhang & von Rintelen, 2024 (1)
- Family Stenothyridae Tryon, 1866 (123)
- Family Synceratidae Bartsch, 1920 accepted as Assimineinae H. Adams & A. Adams, 1856
- Family Tanousiidae Starobogatov, 1983 accepted as Horatiinae D. W. Taylor, 1966
- Family Tateidae Thiele, 1925 (435)
- Family Teinostomatidae Cossmann, 1917 (111)
- Family Terrestribythinellidae Sitnikova, Starobogatov & V. V. Anistratenko, 1992 accepted as Bythinellidae Locard, 1893
- Family Tomichiidae Wenz, 1938 (29)
- Family Tornidae Sacco, 1896 (1884) (405)
- Family Truncatellidae J. E. Gray, 1840 (125)
- Family Truncatelloidea incertae sedis (5)
- Family Tutuilanidae Hubendick, 1952 accepted as Omphalotropidinae Thiele, 1927
- Family Vitrinellidae K. J. Bush, 1897 (333)
- Subfamily Fontigentinae D. W. Taylor, 1966 accepted as Fontigentidae D. W. Taylor, 1966
- Subfamily Hemistomiinae Thiele, 1929 accepted as Tateidae Thiele, 1925
- Subfamily Orientalininae Radoman, 1978 accepted as Horatiinae D. W. Taylor, 1966
- Subfamily Stenothyrinae Tryon, 1866 accepted as Stenothyridae Tryon, 1866
- Subfamily Tomichiinae Wenz, 1938 accepted as Tomichiidae Wenz, 1938
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (648)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 828)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 224)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata