Between brackets is the number of accepted species

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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)
- 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 J. E. Gray, 1847
- Family Palaeorissoinidae Gründel & Kowalke, 2002 † (26)
- Family Rissoidae J. E. Gray, 1847 (1 351)
- 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)
- Subfamily Stosiciinae Faber & Gori, 2016 (28)
- Subfamily Zebininae Coan, 1964
- Genus Amaurella A. Adams, 1867 accepted as Microstelma A. Adams, 1863
- Genus Atlantorissoina Kosuge, 1965 accepted as Schwartziella G. Nevill, 1881
- Genus Cibdezebina Woodring, 1928 accepted as Zebina H. Adams & A. Adams, 1854
- Genus Cossmannia R. B. Newton, 1891 † (3)
- Genus Crepitacella Guppy, 1867 accepted as Microstelma A. Adams, 1863
- Genus Dentrissoina Laseron, 1956 accepted as Tomlinella Viader, 1938
- Genus Diastictus Cossmann, 1888 † accepted as Cossmannia R. B. Newton, 1891 †
- Genus Dolophanes Gabb, 1873 accepted as Microstelma A. Adams, 1863
- Genus Folinia Crosse, 1868 (3)
- Genus Foliniinae F. Nordsieck, 1972 accepted as Rissoinidae W. Stimpson, 1865
- Genus Iopsis Gabb, 1873 accepted as Zebina H. Adams & A. Adams, 1854
- Genus Ishimoria Kuroda, 1960 accepted as Tomlinella Viader, 1938
- Genus Isselia Schmeltz, 1874 accepted as Isseliella Weinkauff, 1881
- Genus Lapsigyrus S. S. Berry, 1958 (3)
- Genus Microstelma A. Adams, 1863 (19)
- Genus Microtaphrus Cossmann, 1888 † accepted as Pseudotaphrus (Microtaphrus) Cossmann, 1888 †
- Genus Mirarissoina Woodring, 1928 (7)
- Genus Pandalosia Laseron, 1956 (7)
- Species Pandalosia darwinensis Laseron, 1956 accepted as Pandalosia subfirmata (O. Boettger, 1887)
- Species Pandalosia delicatula Laseron, 1956
- Species Pandalosia ephamilla (R. B. Watson, 1886)
- Species Pandalosia excelsis Laseron, 1956 accepted as Pandalosia subfirmata (O. Boettger, 1887)
- Species Pandalosia lutaoi C.-K. Chang & W.-L. Wu, 2004
- Species Pandalosia minuta (G. Nevill & H. Nevill, 1874)
- Species Pandalosia mizunamiensis Itoigawa & Nishimoto, 1984 accepted as Pandalosia ephamilla (R. B. Watson, 1886)
- Species Pandalosia moerchiella C.-K. Chang & W.-L. Wu, 2004
- Species Pandalosia obtusa Laseron, 1956 accepted as Pandalosia subfirmata (O. Boettger, 1887)
- Species Pandalosia oceanica Laseron, 1956
- Species Pandalosia subfirmata (O. Boettger, 1887)
- Species Pandalosia subulata Laseron, 1956
- Species Pandalosia viticula (Laseron, 1956)
- Genus Pseudoschwartziella Bandel, 2006 accepted as Pandalosia Laseron, 1956
- Genus Pseudotaphrus Cossmann, 1888 † (9)
- Genus Schwartziella G. Nevill, 1881 (81)
- Genus Stossichia O. Boettger, 1887 accepted as Stosicia Brusina, 1871
- Genus Stossicia Cossmann, 1921 accepted as Stosicia Brusina, 1871
- Genus Takirissoina Oyama, 1962 (2)
- Genus Tiphyocerma S. S. Berry, 1958 accepted as Zebina H. Adams & A. Adams, 1854
- Genus Tomlinella Viader, 1938 (3)
- Genus Zebina H. Adams & A. Adams, 1854 (67)
- 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 (23 716)
- 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