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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)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (218)
- 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 (1 285)
- 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 (688)
- 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 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- 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 (366)
- Family Bythinellidae Locard, 1893 (213)
- Family Caecidae J. E. Gray, 1850 (286)
- 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 (2 110)
- 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)
- Subgenus Bythiospeum (Paladilhiopsis) Pavlović, 1913 accepted as Paladilhiopsis Pavlović, 1913
- Species Bythiospeum acicula (Held, 1838)
- Species Bythiospeum aciculoides (Clessin, 1909)
- Species Bythiospeum allingense (Clessin, 1877) accepted as Bythiospeum acicula (Held, 1838)
- Species Bythiospeum alpillense H. Girardi, 2009 accepted as Bythiospeum diaphanum alpillense H. Girardi, 2009
- Species Bythiospeum alpinum R. Bernasconi, 1988
- Species Bythiospeum alzense Boeters, 2001
- Species Bythiospeum anglesianum (Westerlund, 1890)
- Species Bythiospeum articense R. Bernasconi, 1985
- Species Bythiospeum bechevi Georgiev & Glöer, 2013
- Species Bythiospeum blihense Glöer & Grego, 2015 accepted as Paladilhiopsis blihensis (Glöer & Grego, 2015)
- Species Bythiospeum blihensis [sic] accepted as Bythiospeum blihense Glöer & Grego, 2015
- Species Bythiospeum bogici Pešić & Glöer, 2012 accepted as Montenegrospeum bogici (Pešić & Glöer, 2012)
- Species Bythiospeum bormanni (Stojaspal, 1978)
- Species Bythiospeum bourguignati (Paladilhe, 1866)
- Species Bythiospeum bournense H. Girardi, 2009
- Species Bythiospeum bressanum R. Bernasconi, 1985
- Species Bythiospeum buresi (A. J. Wagner, 1928) accepted as Paladilhiopsis buresi A. J. Wagner, 1928
- Species Bythiospeum carpathicum (Soós, 1940) accepted as Paladilhiopsis carpathica (L. Soós, 1940)
- Species Bythiospeum charpyi (Paladilhe, 1867)
- Species Bythiospeum cisterciensorum (P. L. Reischütz, 1983)
- Species Bythiospeum claisei H. Girardi, 2017
- Species Bythiospeum clessini (Weinland, 1883)
- Species Bythiospeum copiosum (Angelov, 1972) accepted as Paladilhiopsis buresi copiosus Angelov, 1972
- Species Bythiospeum curtum (Nicolas, 1891)
- Species Bythiospeum demattiai Glöer & Pešić, 2014
- Species Bythiospeum dervovici Glöer & Mulaomerović, 2021
- Species Bythiospeum devetakium Georgiev & Glöer, 2013 accepted as Devetakiola devetakia (Glöer & Georgiev, 2013)
- Species Bythiospeum diaphanoides R. Bernasconi, 1985
- Species Bythiospeum diaphanum (Michaud, 1831)
- Species Bythiospeum dorvani R. Bernasconi, 1985
- Species Bythiospeum dourdeni Georgiev, 2012
- Species Bythiospeum drouetianum (Clessin, 1882)
- Species Bythiospeum dubium (Geyer, 1904)
- Species Bythiospeum elseri (A. Fuchs, 1929)
- Species Bythiospeum excelsior (Mahler, 1950)
- Species Bythiospeum excessum (Mahler, 1950)
- Species Bythiospeum exiguum (Geyer, 1904)
- Species Bythiospeum fernetense H. Girardi, 2009 accepted as Bythiospeum diaphanum fernetense H. Girardi, 2009
- Species Bythiospeum francomontanum R. Bernasconi, 1973
- Species Bythiospeum gardonense H. Girardi, 2009
- Species Bythiospeum garnieri (Sayn, 1889)
- Species Bythiospeum gebhardti J. Wágner, 1931
- Species Bythiospeum geyeri (A. Fuchs, 1925)
- Species Bythiospeum gittenbergeri (A. Reischütz & P. L. Reischütz, 2008) accepted as Paladilhiopsis gittenbergeri (A. Reischütz & P. L. Reischütz, 2008)
- Species Bythiospeum gloriae Rolán & Martínez-Ortí, 2003 accepted as Spiralix gloriae (Rolán & Martínez-Ortí, 2003)
- Species Bythiospeum gonostoma (Geyer, 1905)
- Species Bythiospeum goviensis (Geyer, 1907)
- Species Bythiospeum haessleini (Zwanziger, 1939)
- Species Bythiospeum haeussleri (Clessin, 1890)
- Species Bythiospeum heldii (Clessin, 1909)
- Species Bythiospeum helveticum (Clessin, 1882)
- Species Bythiospeum hrustovoense Glöer & Grego, 2015
- Species Bythiospeum hrustovoensis [sic] accepted as Bythiospeum hrustovoense Glöer & Grego, 2015
- Species Bythiospeum hungaricum (Soós, 1927) accepted as Iglica hungarica (Soós, 1927)
- Species Bythiospeum husmanni (C. R. Boettger, 1963)
- Species Bythiospeum iltchoi Georgiev & Glöer, 2015
- Species Bythiospeum iltchokolevi Georgiev & Glöer, 2015
- Species Bythiospeum jazzi Georgiev & Glöer, 2013
- Species Bythiospeum josianae H. Girardi, Wienin, M. Girardi & Racamond, 2017
- Species Bythiospeum juliae Georgiev & Glöer, 2015
- Species Bythiospeum klemmi (Boeters, 1969)
- Species Bythiospeum kolevi Georgiev, 2013
- Species Bythiospeum labiatum (Geyer, 1904)
- Species Bythiospeum lamperti (Geyer, 1907)
- Species Bythiospeum leruthi (C. R. Boettger, 1940)
- Species Bythiospeum maroskoi Glöer & Grego, 2015 accepted as Paladilhiopsis maroskoi (Glöer & Grego, 2015)
- Species Bythiospeum michaelleae H. Girardi, 2002 accepted as Bythiospeum michaellense H. Girardi, 2002
- Species Bythiospeum michaellense H. Girardi, 2002 accepted as Bythiospeum diaphanum michaellense H. Girardi, 2002
- Species Bythiospeum michaudi (Locard, 1883)
- Species Bythiospeum montbrunense H. Girardi & Bertrand, 2009 accepted as Bythiospeum diaphanum montbrunense H. Girardi & Bertrand, 2009
- Species Bythiospeum moussonianum (Paladilhe, 1869)
- Species Bythiospeum neglectissimum Falniowski & Šteffek, 1989 accepted as Falniowskia neglectissima (Falniowski & Šteffek, 1989)
- Species Bythiospeum nemausense H. Girardi, 2012
- Species Bythiospeum nocki Haase, Weigand & Haseke, 2000
- Species Bythiospeum nolli (Bolling, 1938)
- Species Bythiospeum noricum (A. Fuchs, 1929)
- Species Bythiospeum oshanovae (L. Pintér, 1968)
- Species Bythiospeum pandurskii Georgiev, 2012
- Species Bythiospeum pellucidum (Seckendorf, 1846)
- Species Bythiospeum petroedei Glöer & Grego, 2015
- Species Bythiospeum pfeifferi (Clessin, 1890)
- Species Bythiospeum photophilum (Geyer, 1907)
- Species Bythiospeum plivense Glöer & Grego, 2015
- Species Bythiospeum plivensis [sic] accepted as Bythiospeum plivense Glöer & Grego, 2015
- Species Bythiospeum priei H. Girardi, 2017
- Species Bythiospeum puerkhaueri (Clessin, 1877)
- Species Bythiospeum putei (Geyer, 1904)
- Species Bythiospeum quenstedti (Wiedersheim, 1873)
- Species Bythiospeum racovitzai (Germain, 1911)
- Species Bythiospeum rasini H. Girardi, 2004 accepted as Meyrargueria rasini (H. Girardi, 2004)
- Species Bythiospeum reisalpense (P. L. Reischütz, 1983)
- Species Bythiospeum rhenanum (Lais, 1935)
- Species Bythiospeum sandbergeri (Flach, 1886)
- Species Bythiospeum sarriansense H. Girardi, 2009 accepted as Bythiospeum diaphanum sarriansense H. Girardi, 2009
- Species Bythiospeum saxigenum (Geyer, 1905)
- Species Bythiospeum schniebsae Georgiev, 2011 accepted as Balkanospeum schniebsae (Georgiev, 2011)
- Species Bythiospeum senefelderi (Geyer, 1907)
- Species Bythiospeum simovi Georgiev, 2013
- Species Bythiospeum steinheimense (Gottschick, 1921) †
- Species Bythiospeum sterkianum (Clessin, 1882)
- Species Bythiospeum stoyanovi Georgiev, 2013 accepted as Stoyanovia stoyanovi (Georgiev, 2013)
- Species Bythiospeum suevicum (Geyer, 1905)
- Species Bythiospeum szarowskae Glöer, Grego, Erőss & Fehér, 2015 accepted as Paladilhiopsis szarowskae (Glöer, Grego, Erőss & Fehér, 2015)
- Species Bythiospeum taxisi (Geyer, 1907)
- Species Bythiospeum tellinii Pollonera, 1886 accepted as Iglica tellinii (Pollonera, 1886)
- Species Bythiospeum terveri (Locard, 1883)
- Species Bythiospeum transsylvanicum (Rotarides, 1943)
- Species Bythiospeum tschapecki (Clessin, 1878)
- Species Bythiospeum turgens Dehm, 1971 † accepted as Bythiospeum acicula (Held, 1838)
- Species Bythiospeum turritum (Clessin, 1877)
- Species Bythiospeum vallei (Fo. Giusti & Pezzoli, 1976)
- Species Bythiospeum valqueyrasense H. Girardi, 2015
- Species Bythiospeum waegelei (Hässlein, 1938)
- Species Bythiospeum wiaaiglica A. Reischütz & P. L. Reischütz, 2006
- Species Bythiospeum zwanzigeri (Hasslein, 1942)
- 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)
- 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 † (11)
- 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 (261)
- 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 (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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 (6 782)
- 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
