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)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 940)
- Superfamily Neogastropoda incertae sedis (296)
- Family Babyloniidae Kuroda, Habe & Oyama, 1971 (34)
- Family Clavilithidae Vermeij & M. A. Snyder, 2018 † (40)
- Genus Austrolithes H. J. Finlay, 1931 † (4)
- Genus Chiralithes Olsson, 1930 †
- Genus Clavella Swainson, 1835 † accepted as Clavilithes Swainson, 1840 †
- Genus Clavellofusus Grabau, 1904 † (2)
- Genus Clavilithes Swainson, 1840 † (25)
- Genus Cosmolithes Grabau, 1904 † (4)
- Species Cosmolithes costarius (Deshayes, 1835) †
- Species Cosmolithes laevigatus (Gmelin, 1791) †
- Species Cosmolithes lemarchandi (Cossmann, 1907) †
- Species Cosmolithes uniplicatus (Lamarck, 1803) †
- Genus Indolithes Dharma, 2024 † (1)
- Genus Liralithes Vermeij, Raven & Harzhauser, 2024 † (3)
- Genus Mancorus Olsson, 1931 † (1)
- Genus Papillina Conrad, 1855 †
- Genus Perulithes Olsson, 1930 †
- Genus Rhopalithes Grabau, 1904 † accepted as Clavilithes Swainson, 1840 †
- Genus Turrispira Conrad, 1866 † accepted as Clavilithes Swainson, 1840 †
- Family Harpidae Bronn, 1849 (110)
- Family Johnwyattiidae Serna, 1979 †
- Family Maturifusidae Gründel, 2001 † (18)
- Family Melapiidae Kantor, 1991 accepted as Strepsiduridae Cossmann, 1901
- Family Perissityidae Popenoe & Saul, 1987 † (1)
- Family Pseudotritoniidae A. N. Golikov & Starobogatov, 1987 † (5)
- Family Purpurinidae Zittel, 1895 † (36)
- Family Speightiidae A. W. B. Powell, 1942 † (2)
- Family Strepsiduridae Cossmann, 1901 (11)
- Family Taiomidae H. J. Finlay & Marwick, 1937 † (5)
- Subfamily Siphopsinae Le Renard, 1995 † accepted as Syphopsinae Le Renard, 2005 †
- Subfamily Syphopsinae Le Renard, 2005 † (33)
- Genus Enigmavasum Poppe & Tagaro, 2005 (1)
- Genus Hyllus Wade, 1917 † accepted as Parafusus Wade, 1918 †
- Genus Parafusus Wade, 1918 †
- Genus Wadia Cossmann, 1920 † accepted as Parafusus Wade, 1918 †
- 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