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)
- Order Neogastropoda (23 716)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 674)
- Superfamily Mitroidea Swainson, 1831 (633)
- Family Charitodoronidae Fedosov, Herrmann, Kantor & Bouchet, 2018 (14)
- Family Mitridae Swainson, 1831 (596)
- Subfamily Cylindromitrinae Cossmann, 1899 (59)
- Genus Acuticylindra Iredale, 1929 accepted as Pterygia Röding, 1798
- Genus Cylindra Schumacher, 1817 accepted as Cylindromitra P. Fischer, 1884
- Genus Cylindromitra P. Fischer, 1884 accepted as Pterygia Röding, 1798
- Genus Mauritia H. Adams, 1869 accepted as Nebularia Swainson, 1840
- Genus Mitroidea Pease, 1865 accepted as Nebularia Swainson, 1840
- Genus Mutyca H. Adams & A. Adams, 1853 accepted as Nebularia Swainson, 1840
- Genus Nebularia Swainson, 1840 (38)
- Genus Pterygia Röding, 1798 (20)
- Genus Wormsina Harzhauser & Landau, 2021 † (1)
- Subfamily Imbricariinae Troschel, 1867 (136)
- Subfamily Isarinae Fedosov, Herrmann, Kantor & Bouchet, 2018 (54)
- Subfamily Mitridae incertae sedis (28)
- Subfamily Mitrinae Swainson, 1831 (271)
- Subfamily Pleioptygmatinae Quinn, 1989 (3)
- Subfamily Strigatellinae Troschel, 1869 (43)
- Genus Butonina Beets, 1942 † (1)
- Genus Plochelaea Gabb, 1873 † (1)
- Family Pleioptygmatidae Quinn, 1989 accepted as Pleioptygmatinae Quinn, 1989
- Family Pyramimitridae Cossmann, 1901 (23)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 940)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (55)
- Superfamily Pseudolivoidea De Gregorio, 1880 accepted as Olivoidea Latreille, 1825
- Superfamily Pyrifusoidea Bandel & Dockery, 2001 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Sarganoidea Stephenson, 1923 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Toxoglossa Troschel, 1848 accepted as Conoidea J. Fleming, 1822
- Superfamily Turbinelloidea Swainson, 1835 (1 252)
- Superfamily Volutoidea Rafinesque, 1815 (3 873)
- 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