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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 917)
- Order Caenogastropoda incertae sedis (7 675)
- Order Littorinimorpha (17 171)
- 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 (1 279)
- 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 (2 309)
- Family Anabathroninae Coan, 1964 accepted as Anabathridae Keen, 1971
- Family Ansolidae Slavoshevskaya, 1975 accepted as Barleeiidae J. E. Gray, 1857
- Family Barleeidae [sic] accepted as Barleeiidae J. E. Gray, 1857
- Family Barleeiidae J. E. Gray, 1857 (104)
- Family Emblandidae Ponder, 1985 (1)
- Family Falsobuvignidae Gründel, Keupp & F. Lang, 2019 † (1)
- Family Lironobidae Ponder, 1967 (67)
- Family Merelinidae A. N. Golikov & Starobogatov, 1975 accepted as Lironobidae Ponder, 1967
- Family Onobidae A. N. Golikov & Starobogatov, 1975 accepted as Rissoidae Gray, 1847
- Family Palaeorissoinidae Gründel & Kowalke, 2002 † (26)
- Family Rissoidae Gray, 1847 (1 349)
- Subfamily Archascheniinae Zhgenti, 1991 † (2)
- Subfamily Cingulinae Keen, 1971 accepted as Rissoidae Gray, 1847
- Subfamily Mohrensterniinae Korobkov, 1955 † (22)
- Subfamily Rissoinae Gray, 1847 accepted as Rissoidae Gray, 1847
- Subfamily Rissoininae W. Stimpson, 1865 accepted as Rissoinidae W. Stimpson, 1865
- Subfamily Setiinae V. V. Anistratenko & Starobogatov, 1994 accepted as Rissoidae Gray, 1847
- Genus Acinopsis Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Acinus Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Actonia Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Adolphinoba A. W. B. Powell, 1930 accepted as Attenuata Hedley, 1918
- Genus Alcidia Monterosato, 1890 accepted as Alvania Risso, 1826
- Genus Alsatia Andreae, 1884 † (1)
- Genus Alvanea [sic] accepted as Alvania Risso, 1826
- Genus Alvania Risso, 1826 (478)
- Genus Alvinia Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Ameririssoa Ponder, 1985 accepted as Alvania Risso, 1826
- Genus Amphirissoa Dautzenberg & H. Fischer, 1897 (1)
- Genus Apicularia Monterosato, 1884 accepted as Rissoa Desmarest, 1814 (1)
- Genus Arctonia A. N. Golikov, 1977 accepted as Frigidoalvania Warén, 1974
- Genus Arsenia Monterosato, 1891 accepted as Alvania Risso, 1826
- Genus Assiminopsis Locard, 1897 accepted as Benthonella Dall, 1889
- Genus Auriconoba F. Nordsieck, 1972 accepted as Rissoa Desmarest, 1814
- Genus Austronoba A. W. B. Powell, 1927 accepted as Onoba H. Adams & A. Adams, 1852
- Genus Badenia H. J. Finlay, 1930 † accepted as Onoba (Ovirissoa) Hedley, 1916
- Genus Banlashania X.-H. Yu, 1987 † (2)
- Genus Benthonella Dall, 1889 (16)
- Genus Benthonellania Lozouet, 1990 (30)
- Genus Boreocingula A. N. Golikov & Kussakin, 1974 (5)
- Genus Boreomica Guzhov, 2017 † (2)
- Genus Botryphallus Ponder, 1990 (3)
- Genus Calvadosia Cossmann, 1921 † accepted as Calvadosiella Wenz, 1939 †
- Genus Calvadosiella Wenz, 1939 † (1)
- Genus Cingilla Monterosato, 1884 accepted as Cingula J. Fleming, 1818
- Genus Cingula J. Fleming, 1818 (48)
- Genus Cingulina Monterosato, 1884 accepted as Obtusella Cossmann, 1921
- Genus Conalvinia Ponder, 1967 accepted as Alvania Risso, 1826
- Genus Crisilla Monterosato, 1917 (46)
- Genus Ellenstrongia Amati, Di Giulio & Oliverio, 2023 (1)
- Genus Falsisetia A. N. Golikov & Kussakin, 1967 accepted as Lucidestea Laseron, 1956
- Genus Flemellia F. Nordsieck, 1972 accepted as Alvania Risso, 1826
- Genus Flemingia Jeffreys, 1884 accepted as Alvania Risso, 1826
- Genus Frigidoalvania Warén, 1974 (9)
- Genus Galeodina Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Galeodinopsis Sacco, 1895 (5)
- Genus Gofasia Bouchet & Warén, 1993 (7)
- Genus Goniostoma A. Villa & J. B. Villa, 1841 accepted as Rissoa Desmarest, 1814
- Genus Gueriniana F. Nordsieck, 1972 accepted as Rissoa Desmarest, 1814
- Genus Haurakia Iredale, 1915 (36)
- Genus Haurakiopsis A. W. B. Powell, 1937 accepted as Haurakia Iredale, 1915
- Genus Hela Jeffreys, 1870 accepted as Benthonella Dall, 1889
- Genus Hirsonella J.-C. Fischer, 1969 † (1)
- Genus Ihungia Marwick, 1931 † (8)
- Genus Koskinakra Kadolsky, 2016 † (1)
- Genus Lamarckia Leach, 1852 accepted as Rissoa Desmarest, 1814
- Genus Lilacinia F. Nordsieck, 1972 accepted as Rissoa Desmarest, 1814
- Genus Linemera H. J. Finlay, 1924 accepted as Alvania (Linemera) H. J. Finlay, 1924 (1)
- Genus Liroculma Ponder, 1967 accepted as Onoba (Subestea) Cotton, 1944
- Genus Loxostoma Bivona e Bernardi, 1838 accepted as Rissoa Desmarest, 1814
- Genus Lucidestea Laseron, 1956 (21)
- Genus Madeiranzonia Moolenbeek & Faber, 2007 (1)
- Genus Manawatawhia A. W. B. Powell, 1937 accepted as Onoba (Manawatawhia) A. W. B. Powell, 1937
- Genus Manzonia Brusina, 1870 (43)
- Genus Massotia Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Alvania Risso, 1826
- Genus Mereliniopsis Ponder, 1967 accepted as Merelina Iredale, 1915
- Genus Micromanzonia Moolenbeek & Raven, 2024 (1)
- Genus Moniziella F. Nordsieck, 1972 accepted as Alvania Risso, 1826
- Genus Mutiturboella F. Nordsieck, 1972 accepted as Pusillina Monterosato, 1884
- Genus Nobolira H. J. Finlay, 1926 accepted as Attenuata Hedley, 1918
- Genus Obtusella Cossmann, 1921 (10)
- Genus Omanimerelina Moolenbeek & Bosch, 2007 (1)
- Genus Onoba H. Adams & A. Adams, 1852 (121)
- Genus Ovirissoa Hedley, 1916 accepted as Onoba (Ovirissoa) Hedley, 1916 (3)
- Genus Palaeoceratia Gründel, 1999 † (1)
- Genus Parashiela Laseron, 1956 (9)
- Genus Parvisetia Monterosato, 1884 accepted as Setia H. Adams & A. Adams, 1852
- Genus Paryphostoma Bayan, 1873 † (1)
- Genus Peringiella Monterosato, 1878 (5)
- Genus Persephona Leach, 1852 accepted as Rissoa Desmarest, 1814
- Genus Plagiostyla Fischer, 1872 accepted as Plagyostila de Folin, 1872
- Genus Plagyostila de Folin, 1872 (3)
- Genus Polyhyba F. Haas, 1947
- Genus Pontiturboella Sitnikova, Starobogatov & V. Anistratenko, 1992 (1)
- Genus Porosalvania Gofas, 2007 (8)
- Genus Powellia H. J. Finlay, 1926 † accepted as Badenia H. J. Finlay, 1930 †
- Genus Powellisetia Ponder, 1965 (32)
- Genus Profundialvania Taviani, 1975 accepted as Alvania Risso, 1826
- Genus Promerelina A. W. B. Powell, 1926 accepted as Merelina Iredale, 1915
- Genus Pseudalvania A. W. Janssen, 1967 accepted as Alvania Risso, 1826
- Genus Pseudosetia Monterosato, 1884 (12)
- Genus Punctulum Jeffreys, 1884 (6)
- Genus Pusillina Monterosato, 1884 (30)
- Genus Pyrgosformisia J. Barros, S. Lima & D. Tenório, 2018 (1)
- Genus Quarkia Faber, 2009 (1)
- Genus Radiata [sic] accepted as Pusillina Monterosato, 1884
- Genus Rissoa Desmarest, 1814 (199)
- Genus Rissoia Bronn, 1848 accepted as Rissoa Desmarest, 1814 (1)
- Genus Rissooidea incertae sedis
- Genus Rissostomia G. O. Sars, 1878 accepted as Rissoa Desmarest, 1814
- Genus Rudolphosetia Monterosato, 1917 accepted as Setia H. Adams & A. Adams, 1852
- Genus Sabanaea Leach, 1847 accepted as Cingula J. Fleming, 1818
- Genus Sabanea Leach in Gray, 1847 sensu Monterosato, 1884 accepted as Pusillina Monterosato, 1884
- Genus Sabanea [sic] accepted as Cingula J. Fleming, 1818
- Genus Schwartzia Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Rissoa Desmarest, 1814
- Genus Setia H. Adams & A. Adams, 1852 (32)
- Subgenus Setia (Crisillosetia) F. Nordsieck, 1972 accepted as Crisilla Monterosato, 1917
- Subgenus Setia (Obtusella) Cossmann, 1921 accepted as Obtusella Cossmann, 1921
- Species Setia aartseni (Verduin, 1984) accepted as Crisilla aartseni (Verduin, 1984)
- Species Setia alaskana (Bartsch, 1912) accepted as Boreocingula alaskana (Bartsch, 1912)
- Species Setia alboranensis Peñas & Rolán, 2006
- Species Setia albugo (R. B. Watson, 1873) accepted as Rissoa albugo R. B. Watson, 1873
- Species Setia alexandrae S. P. Ávila & Cordeiro, 2015 accepted as Rissoella alexandrae (S. P. Ávila & Cordeiro, 2015)
- Species Setia amabilis (Locard, 1886)
- Species Setia ambigua (Brugnone, 1873)
- Species Setia anselmoi (van Aartsen & Engl, 1999)
- Species Setia antipolitana (van der Linden & W. M. Wagner, 1987)
- Species Setia atropurpurea Frauenfeld, 1867 accepted as Eatoniella atropurpurea (Frauenfeld, 1867)
- Species Setia beniamina (Monterosato, 1884) accepted as Crisilla beniamina (Monterosato, 1884)
- Species Setia bifasciata A. Adams, 1861 accepted as Putilla bifasciata (A. Adams, 1861)
- Species Setia bruggeni (Verduin, 1984)
- Species Setia candida A. Adams, 1861 accepted as Charisma candida (A. Adams, 1861)
- Species Setia depicta (Manzoni, 1868) accepted as Crisilla depicta (Manzoni, 1868)
- Species Setia ermelindoi S. P. Ávila & Cordeiro, 2015 accepted as Rissoella ermelindoi (S. P. Ávila & Cordeiro, 2015)
- Species Setia exigua (Eichwald, 1830) † accepted as Rissoa exigua Eichwald, 1830 †
- Species Setia fusca (R. A. Philippi, 1841)
- Species Setia gianninii F. Nordsieck, 1974 accepted as Onoba gianninii (F. Nordsieck, 1974)
- Species Setia gittenbergeri (Verduin, 1984)
- Species Setia globosa G. Seguenza, 1879 †
- Species Setia globulinus Monterosato, 1884
- Species Setia homerica Romani & Scuderi, 2015
- Species Setia impolite Rolán & Hernández, 2006
- Species Setia incognita Perugia, 2021
- Species Setia inflata Monterosato, 1884 accepted as Setia fusca (R. A. Philippi, 1841)
- Species Setia innominata (R. B. Watson, 1897) accepted as Crisilla innominata (R. B. Watson, 1897)
- Species Setia jansseni (Verduin, 1984)
- Species Setia kuiperi (Verduin, 1984) accepted as Setia limpida Monterosato, 1884
- Species Setia lacourti (Verduin, 1984)
- Species Setia laevigata (Eichwald, 1830) † accepted as Onoba laevigata (Eichwald, 1830) †
- Species Setia latior (Mighels & C. B. Adams, 1842) accepted as Cingula latior Mighels & C. B. Adams, 1842
- Species Setia levantina Bogi & Galil, 2007
- Species Setia lidyae Verduin, 1988 accepted as Crisilla iunoniae (Palazzi, 1988)
- Species Setia limpida Monterosato, 1884
- Species Setia macilenta Monterosato, 1880 accepted as Obtusella macilenta (Monterosato, 1880)
- Species Setia maculata (Monterosato, 1869) accepted as Crisilla maculata (Monterosato, 1869)
- Species Setia marmorata (Cantraine, 1842) accepted as Crisilla semistriata (Montagu, 1808)
- Species Setia miae Verduin, 1988
- Species Setia microbia H. J. Hoenselaar & J. Hoenselaar, 1991
- Species Setia minutissima Landau, Van Dingenen & Ceulemans, 2023 †
- Species Setia netoae S. P. Ávila & Cordeiro, 2015 accepted as Rissoella netoae (S. P. Ávila & Cordeiro, 2015)
- Species Setia nicoleae Segers, Swinnen & De Prins, 2009
- Species Setia nitens Frauenfeld, 1867 accepted as Lucidestea nitens (Frauenfeld, 1867)
- Species Setia nomeae Moolenbeek & Piersma, 1990
- Species Setia occidentalis Le Renard, 1990 †
- Species Setia ochroleuca Brusina, 1869 accepted as Eatonina ochroleuca (Brusina, 1869)
- Species Setia pallaryi Hornung & Mermod, 1927 accepted as Lucidestea pallaryi (Hornung & Mermod, 1927)
- Species Setia perminima (Manzoni, 1868) accepted as Crisilla perminima (Manzoni, 1868)
- Subspecies Setia perminima altaspira F. Nordsieck, 1972 accepted as Crisilla beniamina (Monterosato, 1884)
- Species Setia pulcherrima (Jeffreys, 1848)
- Species Setia pumila Monterosato, 1884 accepted as Eatonina pumila (Monterosato, 1884)
- Species Setia pupina Cossmann & Peyrot, 1918 †
- Species Setia quisquiliarum (R. B. Watson, 1886) accepted as Crisilla quisquiliarum (R. B. Watson, 1886)
- Species Setia roseotincta Dautzenberg, 1889 accepted as Obtusella roseotincta (Dautzenberg, 1889)
- Species Setia scillae (Aradas & Benoit, 1876)
- Species Setia sciutiana (Aradas & Benoit, 1874)
- Species Setia semistriata (Montagu, 1808) accepted as Crisilla semistriata (Montagu, 1808)
- Species Setia slikorum (Verduin, 1984)
- Species Setia soluta (R. A. Philippi, 1844) accepted as Setia fusca (R. A. Philippi, 1841)
- Species Setia soniacrabbeae Swinnen & Nappo, 2023
- Species Setia subsulcata (R. A. Philippi, 1844) accepted as Crisilla semistriata (Montagu, 1808)
- Species Setia subvaricosa Gofas, 1990
- Species Setia tenuisculpta (R. B. Watson, 1873) accepted as Talassia tenuisculpta (R. B. Watson, 1873)
- Species Setia tiberiana (Issel, 1869) accepted as Voorwindia tiberiana (Issel, 1869)
- Species Setia translucida F. Nordsieck, 1972 accepted as Rissoella diaphana (Alder, 1848)
- Species Setia triangularis (R. B. Watson, 1886)
- Species Setia tricincta A. Adams, 1861
- Species Setia tumidula (G. O. Sars, 1878) accepted as Pusillina tumidula (G. O. Sars, 1878)
- Species Setia turgida (Jeffreys, 1870) accepted as Pseudosetia turgida (Jeffreys, 1870)
- Species Setia turriculata Monterosato, 1884
- Species Setia ugesae Verduin, 1988 accepted as Crisilla ugesae (Verduin, 1988)
- Species Setia valvatoides Milaschewitsch, 1909
- Genus Sfaxiella F. Nordsieck, 1972 accepted as Rissoa Desmarest, 1814
- Genus Similalvania Chirli & Forli, 2021 † (1)
- Genus Simulamerelina Ponder, 1985 (25)
- Genus Striatestea A. W. B. Powell, 1927 (4)
- Genus Subestea Cotton, 1944 (7)
- Genus Subonoba Iredale, 1915 (27)
- Genus Taramellia L. Seguenza, 1903 accepted as Alvania Risso, 1826
- Genus Thapsia Monterosato, 1884 accepted as Alvania Risso, 1826
- Genus Thapsiella P. Fischer, 1885 accepted as Alvania Risso, 1826
- Genus Thierachella J.-C. Fischer, 1969 † (2)
- Genus Trochoturbella Cossmann, 1921 † (5)
- Genus Turbella [sic] accepted as Turboella Leach, 1847
- Genus Turboella Leach, 1847 accepted as Rissoa Desmarest, 1814 (4)
- Genus Turbona Leach, 1847 accepted as Alvania Risso, 1826
- Genus Turgidina Verduin, 1979 accepted as Pusillina Monterosato, 1884
- Genus Vitricithna Laseron, 1956 accepted as Haurakia Iredale, 1915
- Genus Voorwindia Ponder, 1985 (3)
- Genus Zacanthusa Leach, 1852 accepted as Alvania Risso, 1826
- Genus Zhgentia Iljina, 2006 † (1)
- Genus Zippora Leach, 1852 accepted as Rissoa Desmarest, 1814
- Family Rissoidea accepted as Rissooidea Gray, 1847
- Family Rissoinidae W. Stimpson, 1865 (529)
- Family Rissolinidae Voorwinde, 1966 accepted as Rissoinidae W. Stimpson, 1865
- Family Zebinidae Coan, 1964 (232)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- 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 (23 713)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- 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