Between brackets is the number of accepted species

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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 684)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- Order Neogastropoda (23 752)
- Superfamily Buccinoidea Rafinesque, 1815 (5 255)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 696)
- Superfamily Mitroidea Swainson, 1831 (633)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 941)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (56)
- 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 (1 253)
- Superfamily Volutoidea Rafinesque, 1815 (3 882)
- Family Cancellariidae Forbes & Hanley, 1851 (855)
- Family Cystiscidae W. Stimpson, 1865 (556)
- Family Granulinidae G. A. Coovert & H. K. Coovert, 1995 (155)
- Genus Cypraeolina Cerulli-Irelli, 1911 accepted as Granulina Jousseaume, 1888
- Species Cypraeolina antillensis De Jong & Coomans, 1988 accepted as Granulina antillensis (De Jong & Coomans, 1988)
- Species Cypraeolina cotamago (Yokoyama, 1922) accepted as Granulina cotamago (Yokoyama, 1922)
- Species Cypraeolina dacria (Dall, 1893) †
- Species Cypraeolina solida Makiyama, 1927 † accepted as Granulina solida (Makiyama, 1927) †
- Species Cypraeolina tinolia Dall, 1927 accepted as Granulina tinolia (Dall, 1927)
- Species Cypraeolina truncata Dall, 1927 accepted as Cystiscus truncatus (Dall, 1927)
- Species Cypraeolina vanhareni van Aartsen, Menkhorst & E. Gittenberger, 1984 accepted as Granulina vanhareni (van Aartsen, Menkhorst & E. Gittenberger, 1984)
- Genus Granulina Jousseaume, 1888 (134)
- Genus Granulinella F. Boyer, 2017 (1)
- Genus Granulinopsis F. Boyer, 2017 (3)
- Genus Hiwia Marwick, 1931 † (1)
- Genus Marginellopsis Bavay, 1911 (6)
- Genus Merovia Dall, 1921 accepted as Granulina Jousseaume, 1888
- Genus Microginella Laseron, 1957 accepted as Granulina Jousseaume, 1888
- Genus Paolaura Smriglio & Mariottini, 2001 (5)
- Genus Pugnus Hedley, 1896 (5)
- Family Marginellidae J. Fleming, 1828 (1 445)
- Family Marginellonidae Coan, 1965 (4)
- Family Paladmetidae Stephenson, 1941 † accepted as Admetinae Troschel, 1865
- Family Plesiocystiscidae G. A. Coovert & H. K. Coovert, 1995 accepted as Plesiocystiscinae G. A. Coovert & H. K. Coovert, 1995
- Family Volutidae Rafinesque, 1815 (867)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 180)
- 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 (6 783)
- 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