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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)
- Subfamily Belgrandiellinae Radoman, 1983 (126)
- Subfamily Belgrandiinae De Stefani, 1877 (164)
- Subfamily Bullaregiinae Delicado, Hauffe & Wilke, 2023 (4)
- Subfamily Caspiinae B. Dybowski, 1913 (62)
- Subfamily Chilopyrgulinae Radoman, 1973 accepted as Pyrgulinae Brusina, 1882
- Subfamily Conocaspiinae B. Dybowski & Grochmalicki, 1913
- Subfamily Falsipyrgulinae Radoman, 1973 accepted as Pyrgulinae Brusina, 1882
- Subfamily Graecoanatolicinae Radoman, 1973 accepted as Caspiinae B. Dybowski, 1913
- Subfamily Horatiinae D. W. Taylor, 1966 (112)
- Subfamily Hydrobiinae W. Stimpson, 1865 (271)
- Subfamily Islamiinae Radoman, 1973 (149)
- Subfamily Mercuriinae Boeters & Falkner, 2017 (37)
- Subfamily Navarriellinae García-Guerrero, J. P. Miller & M. A. Ramos, 2023 (1)
- Subfamily Nymphophilinae D. W. Taylor, 1966 (215)
- Subfamily Ohridopyrgulinae Radoman, 1983 accepted as Pyrgulinae Brusina, 1882
- Subfamily Pontobelgrandiellinae Delicado, Hauffe & Wilke, 2023 (27)
- Subfamily Pseudamnicolinae Radoman, 1977 (202)
- Subfamily Pseudohoratiinae Radoman, 1973 accepted as Belgrandiinae De Stefani, 1877
- Subfamily Pyrgorientaliinae Radoman, 1977
- Subfamily Pyrgulinae Brusina, 1882 (267)
- Subfamily Sadlerianinae Radoman, 1973 accepted as Horatiinae D. W. Taylor, 1966
- Subfamily Shadiniinae V. Anistratenko, Peretolchina, Sitnikova & Palatov, 2017 (6)
- Genus Intermaria Delicado, Pešić & Glöer, 2016 (2)
- Genus Nicolaia Glöer, Bößneck, Walther & Neiber, 2016 (1)
- Genus Persipyrgula Delicado, Pešić & Glöer, 2016 (1)
- Genus Shadinia Akramowski, 1976 (2)
- Species Shadinia akramowskii (Zhadin, 1952)
- Species Shadinia bjniensis Bößneck, Walther & Neiber, 2016 accepted as Shadinia terpoghassiani (Zhadin, 1952)
- Species Shadinia terpoghassiani (Zhadin, 1952)
- Subfamily Turricaspiinae B. Dybowski & Grochmalicki, 1915 accepted as Pyrgulinae Brusina, 1882
- Tribe Horatiini D. W. Taylor, 1966 accepted as Horatiinae D. W. Taylor, 1966
- Genus Aghbalia Glöer, Mabrouki & Taybi, 2020 (1)
- Genus Agrafia Szarowska & Falniowski, 2011 (1)
- Genus Ainiella Taybi, Glöer & Mabrouki, 2022 (1)
- Genus Alfahariella Quiñonero-Salgado, López-Soriano, Raven, Glöer & Prieto, 2024 (1)
- Genus Aluta Jekelius, 1933 † accepted as Brasovia Neubauer, Kroh, Harzhauser, Georgopoulou & Mandic, 2015 †
- Genus Anadoludamnicola Şahin, Koca & Yıldırım, 2012 (1)
- Genus Anatolidamnicola [sic] accepted as Anadoludamnicola Şahin, Koca & Yıldırım, 2012
- Genus Angrobia Iredale, 1943 accepted as Austropyrgus Cotton, 1942
- Genus Antillobia Altaba, 1993 accepted as Pyrgophorus Ancey, 1888
- Genus Arabiella Kadolsky, Harzhauser & Neubauer, 2016 † (1)
- Genus Baglivia Brusina, 1892 † (11)
- Genus Bania Brusina, 1896 † (19)
- Genus Banneina Stache, 1889 † (3)
- Genus Beogradica Pavlović, 1927 † (1)
- Genus Berkanella Taybi, Glöer & Mabrouki, 2024 (2)
- Genus Bernicia L. R. Cox, 1927 † (1)
- Genus Brasovia Neubauer, Kroh, Harzhauser, Georgopoulou & Mandic, 2015 † (7)
- Genus Briardia Munier-Chalmas, 1884 † (1)
- Genus Bugesia Paladilhe, 1866
- Genus Calipyrgula Pilsbry, 1934 † accepted as Tryonia W. Stimpson, 1865 (1)
- Genus Charydrobia Stache, 1889 † (11)
- Genus Chazarella A. A. Ali-Zade, 1967 † (3)
- Genus Cirsomphalus Cossmann, 1907 † (2)
- Genus Coelacanthia Andrusov, 1890 † (1)
- Genus Costhyrella Pacaud, 1997 † (4)
- Genus Ctyrokya Schlickum, 1965 † (4)
- Genus Didacus Delicado, Machordom & M. A. Ramos, 2015 accepted as Diegus Delicado, Machordom & M. A. Ramos, 2016
- Genus Docleiana Delicado & Pešić, 2021 accepted as Kerkia Radoman, 1978
- Genus Edrozeba Guzhov, 2022 † (5)
- Genus Falsibelgrandiella Radoman, 1973 (1)
- Genus Fessia Glöer, Mabrouki & Taybi, 2020 (1)
- Genus Frauenfeldia Clessin, 1878 accepted as Graziana Radoman, 1975
- Genus Fuxinia X.-H. Yu, 1982 † (1)
- Genus Gafaita Taybi, Glöer & Mabrouki, 2023 (1)
- Genus Geyeria A. J. Wagner, 1914 accepted as Plagigeyeria Tomlin, 1930
- Genus Giustia Ghamizi & Bodon, 2007
- Genus Goniatogyra Cossmann, 1921 † (2)
- Genus Goniochilus F. Sandberger, 1875 † (22)
- Genus Gyromelania Wenz, 1939 † (3)
- Genus Heideella Backhuys & Boeters, 1974 (2)
- Genus Hemite Gürlek, 2018 (1)
- Genus Hydracme F. Haas, 1938 accepted as Idiopyrgus Pilsbry, 1911
- Genus Hydrobiidae incertae sedis
- Genus Idrisiella Mabrouki, Glöer & Taybi, 2022 (1)
- Genus Ifrania Glöer, Mabrouki & Taybi, 2020 (2)
- Genus Illyricella Neubauer, Mandic & Harzhauser, 2016 † (1)
- Genus Iraklimelania Willmann, 1981 † (4)
- Genus Islamiella Guzhov, 2023 † (2)
- Genus Isparta Yıldırım, Koca, Gürlek & Glöer, 2018 (1)
- Genus Jekeliella Bandel, 2010 † accepted as Polytropis F. Sandberger, 1875 †
- Genus Kadolskya Neubauer & Harzhauser, 2016 † (1)
- Genus Kerchia Bandel, 2010 † (1)
- Genus Khayajehia Pešić & Glöer, 2023 (1)
- Genus Kirelia Radoman, 1977 (2)
- Genus Klecakia Bourguignat, 1881 †
- Genus Lampetiia Glöer & Manolas, 2024 (1)
- Genus Lapparentia Berthelin, 1885 † (11)
- Genus Lartetia Bourguignat, 1869
- Genus Lavansia Bandel, 1991 † (1)
- Genus Leachia Risso, 1826 accepted as Hydrobia W. Hartmann, 1821
- Genus Lhotelleria Bourguignat, 1877
- Genus Liaoheniella Youluo, 1978 †
- Genus Lisinskia Brusina, 1897 † (1)
- Genus Lithoglyphoides Sturany & A. J. Wagner, 1914 accepted as Sadleriana Clessin, 1890
- Genus Litorinella A. Braun, 1843 accepted as Hydrobia W. Hartmann, 1821
- Genus Littorinella [sic] accepted as Hydrobia W. Hartmann, 1821
- Genus Lobaunia Haase, 1993 accepted as Hauffenia Pollonera, 1898
- Genus Locardia de Folin, 1880 accepted as Lhotelleria Bourguignat, 1877
- Genus Lutetiella Kadolsky, 2015 † (2)
- Genus Lyobasis L.-S. Huang, 1987 † (1)
- Genus Lysiogyrus Youluo, 1978 †
- Genus Mahrazia Mabrouki, Taybi & Gloër, 2022 (1)
- Genus Menzella Mabrouki, Glöer & Taybi, 2023 (1)
- Genus Microbeliscus F. Sandberger, 1875 † (2)
- Genus Micropyrgus Meek, 1866 † (5)
- Genus Mienisiella Schütt, 1991 accepted as Islamia Radoman, 1973
- Genus Mikrogoniochilus Willmann, 1981 † (1)
- Genus Minutiana Fagot, 1892 accepted as Globuliana Paladilhe, 1866
- Genus Mirolaminatus H.-J. Wang, 1977 † (38)
- Genus Montjavoultia Raspail, 1909 † (5)
- Genus Muellerpalia Bandel, 2010 † (5)
- Genus Nannopyrgula Youluo, 1978 † (2)
- Genus Navalis Quiñonero-Salgado & Rolán, 2017 (2)
- Genus Nematurella F. Sandberger, 1871 † (22)
- Genus Neohoratia Schütt, 1961
- Genus Obrovia Radoman, 1974 accepted as Hydrobia W. Hartmann, 1821
- Genus Odontohydrobia Pavlović, 1927 † (10)
- Genus Ohridonaumia Glöer & Pešić, 2023 (1)
- Genus Onubiella Martín Álvarez, Quiñonero-Salgado, López-Soriano, Raven & Glöer, 2024 (1)
- Genus Paludestrina A. d'Orbigny, 1841
- Genus Parateinostoma Oppenheim, 1892 † (8)
- Genus Parhydrobia Cossmann & Dollfus, 1913 † (18)
- Genus Paulia Bourguignat, 1882 accepted as Avenionia Nicolas, 1882
- Genus Paulovicia Bourguignat, 1881 †
- Genus Pechelbronnia R. Janssen, 2007 † (1)
- Genus Phaethusa Glöer & Manolas, 2024 (1)
- Genus Pikasia Taybi, Glöer & Mabrouki, 2021 (1)
- Genus Pingyispira Y.-T. Li, 1986 † (2)
- Genus Polatenia Georgiev, 2023 (1)
- Genus Polytropis F. Sandberger, 1875 † (4)
- Genus Pomatiasia Guzhov, 2022 † (1)
- Genus Pontohydrobia Badzoshvili, 1979 † (5)
- Genus Potamaclis F. Sandberger, 1873 † (3)
- Genus Potamolithoides W. B. Marshall & Bowles, 1932 † (2)
- Genus Prespolitorea Radoman, 1973 accepted as Prespolitorea Radoman, 1983
- Genus Probythinella Thiele, 1928 (2)
- Genus Prososthenia Neumayr, 1869 † (67)
- Genus Pseudopaludinella Bourguignat, 1876
- Genus Pseudorientalia Radoman, 1983 (4)
- Genus Ptychotropis Stache, 1889 † accepted as Banneina Stache, 1889 †
- Genus Pupiphryx Iredale, 1943 accepted as Austropyrgus Cotton, 1942
- Genus Pyrgidium Tournouër, 1869 † accepted as Pyrgula De Cristofori & Jan, 1832
- Genus Pyrgulella Harzhauser, Neubauer & Kadolsky, 2016 † (1)
- Genus Renistoma W. Yü, 1977 † (2)
- Genus Rhodopyrgula Willmann, 1981 † (2)
- Genus Rifia Ghamizi, 2020 (1)
- Genus Robicia Brusina, 1897 † (2)
- Genus Saccoia Brusina, 1893 † (8)
- Genus Salaeniella Boeters, Quiñonero-Salgado & Ruiz-Cobo, 2019 (1)
- Genus Salakosia Willmann, 1981 † (1)
- Genus Salalahia Kadolsky, Harzhauser & Neubauer, 2016 † (1)
- Genus Sarmata B. Dybowski & Grochmalicki, 1920 † (2)
- Genus Scalimelania Wenz, 1939 † (1)
- Genus Schapsugia Chertoprud, Palatov & Vinarski, 2021 (3)
- Genus Sellia de Raincourt, 1884 † (3)
- Genus Sheitanok Schütt & Şeşen, 1991 (1)
- Genus Sitnikovia Chertoprud, Palatov & Vinarski, 2020 (2)
- Genus Sivasi Şahin, Koca & Yıldırım, 2012 (1)
- Genus Socenia Jekelius, 1944 † (13)
- Genus Staja Brusina, 1897 † (23)
- Genus Stalioa Brusina, 1870 † (5)
- Genus Stalioia [sic] † accepted as Stalioa Brusina, 1870 †
- Genus Staliopsis Rzehak, 1893 † (6)
- Genus Stygobium Grego & Glöer, 2019 (1)
- Genus Syrofontana Schütt, 1983 (2)
- Genus Tachira Chertoprud, Palatov & Vinarski, 2021 (1)
- Genus Tefennia Schütt & Yıldırım, 2003 (1)
- Genus Terranigra Radoman, 1978 (1)
- Genus Thalassobia Bourguignat, 1876 (1)
- Genus Tianjinospira Youluo, 1978 †
- Genus Torosia Glöer & Georgiev, 2012 (1)
- Genus Tournouerina Schlickum, 1971 † (6)
- Genus Tridentalia Glöer & Hirschfelder, 2023 (1)
- Genus Unicarinata Pan, 1982 † (1)
- Genus Vancleaveia F. C. Baker, 1930 accepted as Probythinella Thiele, 1928
- Genus Vilertia López-Soriano, Quiñonero-Salgado, A. A. Suárez, Rolán & Glöer, 2022 (1)
- Genus Vioscalba J. P. E. Morrison, 1965 accepted as Probythinella Thiele, 1928
- Genus Vrazia Brusina, 1897 † (1)
- Genus Wallaua R. Janssen, 2007 † (1)
- Genus Xestopyrguloides Willmann, 1981 † (3)
- Genus Znassela Taybi, Glöer & Mabrouki, 2023 (1)
- 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)
- 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
