Between brackets is the number of accepted species

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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Suborder Heteroglossa
- Suborder Ptenoglossa
- Superfamily Abyssochrysoidea Tomlin, 1927 (104)
- Superfamily Acteoninoidea Cossmann, 1895 †
- Superfamily Campaniloidea (288)
- Superfamily Cerithioidea J. Fleming, 1822 (3 706)
- Family Alabinidae Dall, 1927 accepted as Bittiinae Cossmann, 1906
- Family Amphimelaniidae P. Fischer & Crosse, 1891 (14)
- Family Anaplocamidae Dall, 1921 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Aplodontidae Kuroda, 1933 accepted as Modulidae P. Fischer, 1884
- Family Archimediellidae Starobogatov, 1982 accepted as Turritellinae Lovén, 1847
- Family Bathanaliidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Batillariidae Thiele, 1929 (99)
- Family Bittiidae accepted as Bittiinae Cossmann, 1906
- Family Brachytrematidae Cossmann, 1906 † (25)
- Subfamily Brachytrematinae Cossmann, 1906 † (7)
- Genus Brachytrema J. Morris & Lycett, 1851 † (5)
- Species Brachytrema buccinoidea (Buvignier, 1843) †
- Species Brachytrema buccinoidea Lycett, 1863 †
- Species Brachytrema buvignieri J. Morris & Lycett, 1851 †
- Species Brachytrema costellatum (Piette, 1856) †
- Species Brachytrema gomondei (J. Morris & Lycett, 1851) †
- Species Brachytrema incerta (A. d'Orbigny, 1845) † accepted as Khetella incerta (A. d'Orbigny, 1845) †
- Species Brachytrema keyserlingiana (Rouillier, 1846) † accepted as Astandes keyserlingianus (Rouillier, 1846) †
- Species Brachytrema kobyi de Loriol, 1889 † accepted as Loriolotrema kobyi (de Loriol, 1889) †
- Species Brachytrema kostromense Gerasimov, 1955 † accepted as Maturifusus kostromensis (Gerasimov, 1955) †
- Species Brachytrema purpuriniforme M. A. Conti & J. C. Fischer, 1982 † accepted as Purpurina purpuriniformis (M. A. Conti & J. C. Fischer, 1982) †
- Species Brachytrema simplex de Loriol, 1895 †
- Species Brachytrema thorenti (d'Archiac, 1843) †
- Species Brachytrema turbiniformis J. Morris & Lycett, 1851 †
- Species Brachytrema varicosa Lycett, 1863 †
- Genus Saalensia Gründel, Keupp & F. Lang, 2019 † (2)
- Subfamily Loriolotrematinae Gründel, Hostettler & Menkveld-Gfeller, 2020 † (5)
- Genus Benoistia Cossmann, 1900 † (12)
- Genus Petersia Gemmellaro, 1870 † (1)
- Family Ceriphasiidae Gill, 1863 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Cerithideidae Houbrick, 1988 accepted as Potamididae H. Adams & A. Adams, 1854
- Family Cerithiidae J. Fleming, 1822 (540)
- Family Cerithioidea incertae sedis (5)
- Family Dialidae Kay, 1979 (18)
- Family Diastomatidae Cossmann, 1894 (32)
- Family Ellipstomatidae Hannibal, 1912 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Eustomatidae Cossmann, 1906 † (1)
- Family Faxiidae Ravn, 1933 † accepted as Sherborniidae Iredale, 1917
- Family Finellidae Thiele, 1929 accepted as Scaliolidae Jousseaume, 1912
- Family Fossaridae A. Adams, 1860 accepted as Fossarinae A. Adams, 1860
- Family Giraudiidae Bourguignat, 1885 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Glauconiidae Pchelintsev, 1953 † accepted as Cassiopidae Beurlen, 1967 †
- Family Hemisinidae P. Fischer & Crosse, 1891 (124)
- Family Hilacanthidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Juramelanatriidae Bandel, 2006 † accepted as Thiaridae Gill, 1871 (1823)
- Family Ladinulidae Bandel, 1992 † (3)
- Family Lavigeriidae Thiele, 1925 accepted as Paludomidae Stoliczka, 1868
- Family Limnotrochidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Litiopidae Gray, 1847 (65)
- Family Maoraxidae Bandel, Gründel & P. A. Maxwell, 2000 † (1)
- Family Melanatriidae Thiele, 1921 accepted as Pachychilidae P. Fischer & Crosse, 1892
- Family Melaniidae Children, 1823 accepted as Thiaridae Gill, 1871 (1823)
- Family Melanoididae Ihering, 1909 accepted as Thiaridae Gill, 1871 (1823)
- Family Melanopsidae H. Adams & A. Adams, 1854 (430)
- Family Modulidae P. Fischer, 1884 (50)
- Family Nassopsidae Kesteven, 1903 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Obtortionidae Thiele, 1925 accepted as Scaliolidae Jousseaume, 1912
- Family Omalaxidae Cossmann, 1916 † accepted as Omalaxinae Cossmann, 1916 †
- Family Pachychilidae P. Fischer & Crosse, 1892 (401)
- Family Pachymelaniidae Bandel & Kowalke, 1999 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Family Paludomidae Stoliczka, 1868 (152)
- Family Paramelaniidae J. E. S. Moore, 1898 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Pelycidiidae Ponder & S. J. Hall, 1983 (17)
- Family Pickworthiidae Iredale, 1917 (98)
- Family Planaxidae J. E. Gray, 1850 (81)
- Family Pleuroceridae P. Fischer, 1885 (1863) (247)
- Family Popenellidae Bandel, 1992 † (1)
- Family Potadomatidae Pilsbry & Bequaert, 1927 accepted as Pachychilidae P. Fischer & Crosse, 1892
- Family Potamididae H. Adams & A. Adams, 1854 (226)
- Family Prisciphoridae Bandel, Gründel & P. A. Maxwell, 2000 † accepted as Eumetulinae A. N. Golikov & Starobogatov, 1975
- Family Procerithiidae Cossmann, 1906 † (35)
- Family Propupaspiridae Nützel, Pan & Erwin, 2002 † (2)
- Family Prostyliferidae Bandel, 1992 † (1)
- Family Pyrazidae Hacobjan, 1972 accepted as Batillariidae Thiele, 1929
- Family Reynellonidae Iredale, 1917 accepted as Pickworthiinae Iredale, 1917
- Family Rumellidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Scaliolidae Jousseaume, 1912 (67)
- Family Semisulcospiridae J. P. E. Morrison, 1952 (135)
- Family Sherborniidae Iredale, 1917 (2)
- Family Siliquariidae Anton, 1838 (57)
- Family Spekiidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Strepomatidae Haldeman, 1864 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Family Styliferinidae Bandel, 1992 accepted as Litiopidae Gray, 1847
- Family Syrnolopsidae Bourguignat, 1890 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Telescopiidae J. K. Allan, 1950 accepted as Potamididae H. Adams & A. Adams, 1854
- Family Tenagodidae Gill, 1871 accepted as Siliquariidae Anton, 1838
- Family Terebrellidae Delpey, 1941 † accepted as Metacerithiidae Cossmann, 1906 †
- Family Thiaridae Gill, 1871 (1823) (224)
- Family Tiphobiidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
- Family Turritellidae Lovén, 1847 (547)
- Family Vermiculariidae Dall, 1915 accepted as Turritellinae Lovén, 1847
- Family Zardinellopsidae Bandel, 2006 † (2)
- Family Zemelanopsidae Neiber & Glaubrecht, 2019 (4)
- Subfamily Aylacostomatinae Parodiz, 1969 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Subfamily Hemisininae P. Fischer & Crosse, 1891 accepted as Hemisinidae P. Fischer & Crosse, 1891
- Superfamily Cerithiopsoidea accepted as Triphoroidea J. E. Gray, 1847
- Superfamily Epitonioidea S. S. Berry, 1910 (1812) (1 093)
- Superfamily Eulimacea accepted as Eulimoidea R. A. Philippi, 1853
- Superfamily Orthonematoidea Nützel & Bandel, 2000 † (107)
- Superfamily Palaeostyloidea Wenz, 1938 † (17)
- Superfamily Peruneloidea Frýda & Bandel, 1997 † (3)
- Superfamily Soleniscoidea Knight, 1931 † (52)
- Superfamily Subulitoidea Lindström, 1884 † (11)
- Superfamily Triphoroidea J. E. Gray, 1847 (2 157)
- Family Acanthonematidae Wenz, 1938 †
- Family Ampezzanildidae Bandel, 1994 † (1)
- Family Aqabarellidae Alhejoj, Bandel & Al-Najjar, 2016 accepted as Tornidae Sacco, 1896 (1884)
- Family Coelostylinidae Cossmann, 1908 † (16)
- Family Lyocyclidae Thiele, 1925 (37)
- Family Plicatusidae Pan & Erwin, 2002 †
- Family Pragoscutulidae Frýda, 1998 †
- Family Pseudomelaniidae R. Hoernes, 1884 † (81)
- Family Spanionematidae A. N. Golikov & Starobogatov, 1987 †
- Family Spirostylidae Cossmann, 1909 †
- Family Trajanellidae Pchelintsev, 1951 † accepted as Pseudomelaniidae R. Hoernes, 1884 †
- Genus Boreioconus Guzhov, 2015 † (1)
- Genus Costasphaera Gründel & Nützel, 2015 † (1)
- Genus Dicolpus R. A. Philippi, 1887 †
- Genus Nixipileolus Guzhov, 2015 † (1)
- Genus Sassenfjordia Kaim, Hryniewicz, C. Little & Nakrem, 2017 † (1)
- Genus Spirocyclina Kittl, 1894 † accepted as Spirocyclus Wenz, 1938 †
- Genus Spirocyclus Wenz, 1938 †
- Order Littorinimorpha (17 189)
- Order Neogastropoda (23 738)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- 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