Between brackets is the number of accepted species
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- Mollusca (133 260)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 078)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 009)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 818)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 691)
- Order Littorinimorpha (17 231)
- Order Neogastropoda (23 828)
- Superfamily Buccinoidea Rafinesque, 1815 (5 271)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 748)
- Superfamily Mitroidea Swainson, 1831 (634)
- Family Charitodoronidae Fedosov, Herrmann, Kantor & Bouchet, 2018 (14)
- Family Mitridae Swainson, 1831 (597)
- Subfamily Cylindromitrinae Cossmann, 1899 (59)
- Subfamily Imbricariinae Troschel, 1867 (136)
- Genus Austroimbricaria A. M. Olivera & Camacho, 1992 † (2)
- Genus Cancilla Swainson, 1840 (32)
- Genus Canilla [sic] accepted as Cancilla Swainson, 1840
- Genus Conoelix Swainson, 1821 accepted as Imbricaria Schumacher, 1817
- Genus Imbricaria Schumacher, 1817 (35)
- Genus Imbricariopsis Fedosov, Herrmann, Kantor & Bouchet, 2018 (4)
- Genus Mitrella Swainson, 1831 accepted as Swainsonia H. Adams & A. Adams, 1853
- Genus Neocancilla Cernohorsky, 1966 (12)
- Genus Pseudocancilla Staadt, 1913 † (1)
- Genus Scabricola Swainson, 1840 (42)
- Genus Scabricula [sic] accepted as Scabricola Swainson, 1840
- Genus Swainsonia H. Adams & A. Adams, 1853 (8)
- Species Swainsonia albina (A. Adams, 1853) accepted as Scabricola albina (A. Adams, 1853)
- Species Swainsonia bicolor (Swainson, 1824) accepted as Scabricola bicolor (Swainson, 1824)
- Species Swainsonia biconica (Bozzetti, 2011)
- Species Swainsonia casta (Gmelin, 1791)
- Species Swainsonia cloveri (Cernohorsky, 1971) accepted as Imbricaria cloveri (Cernohorsky, 1971)
- Species Swainsonia ekerae (Cernohorsky, 1973)
- Species Swainsonia fissurata (Lamarck, 1811)
- Species Swainsonia fusca (Swainson, 1824)
- Species Swainsonia incisa (A. Adams & Reeve, 1850) accepted as Scabricola incisa (A. Adams & Reeve, 1850)
- Species Swainsonia limata (Reeve, 1845)
- Species Swainsonia mariae (A. Adams, 1853) accepted as Scabricola mariae (A. Adams, 1853)
- Species Swainsonia millepunctata (Schepman, 1911) accepted as Swainsonia schepmani (R. Salisbury & E. Guillot de Suduiraut, 2003)
- Species Swainsonia newcombii (Pease, 1869)
- Species Swainsonia ocellata (Swainson, 1831)
- Subspecies Swainsonia ocellata ocellata (Swainson, 1831)
- Subspecies Swainsonia ocellata sublevigata (Bozzetti, 2016)
- Forma Swainsonia ocellata f. mariae (A. Adams, 1853) accepted as Scabricola mariae (A. Adams, 1853)
- Species Swainsonia olivaeformis (Swainson, 1821) accepted as Scabricola olivaeformis (Swainson, 1821)
- Species Swainsonia schepmani (R. Salisbury & E. Guillot de Suduiraut, 2003) accepted as Cancilla schepmani (R. Salisbury & E. Guillot de Suduiraut, 2003)
- 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 Paleofusimitra Sohl, 1963 † (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 (1 151)
- Superfamily Olivoidea Latreille, 1825 (741)
- Superfamily Pholidotomoidea Cossmann, 1896 † (57)
- 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 (1 256)
- Superfamily Volutoidea Rafinesque, 1815 (3 030)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 225)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
