Between brackets is the number of accepted species

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- Mollusca (133 273)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 082)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 018)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 827)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 701)
- Order Littorinimorpha (17 230)
- Order Neogastropoda (23 828)
- Superfamily Buccinoidea Rafinesque, 1815 (5 270)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 744)
- Superfamily Mitroidea Swainson, 1831 (634)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 944)
- 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 (3 031)
- Family Cystiscidae W. Stimpson, 1865 (557)
- Family Granulinidae G. A. Coovert & H. K. Coovert, 1995 (156)
- Family Marginellidae J. Fleming, 1828 (1 447)
- 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)
- Subfamily Amoriinae J. E. Gray, 1857 (170)
- Subfamily Athletinae Pilsbry & Olsson, 1954 (105)
- Subfamily Calliotectinae Pilsbry & Olsson, 1954 (22)
- Genus Butonius K. Martin, 1933 † accepted as Calliotectum Dall, 1890
- Genus Calliotectum Dall, 1890 (11)
- Species Calliotectum dalli (Bartsch, 1942)
- Species Calliotectum egregium Bouchet & Poppe, 1995
- Species Calliotectum marci (Koperberg, 1931) †
- Species Calliotectum mirabile (Clench & Aguayo, 1941)
- Species Calliotectum pectinatum (K. Martin, 1933) †
- Species Calliotectum piersonorum Bouchet & Poppe, 1995
- Species Calliotectum shinzatoense (MacNeil, 1961) †
- Species Calliotectum smithi (Bartsch, 1942)
- Species Calliotectum tibiaeforme (Kuroda, 1931)
- Species Calliotectum vernicosum (Dall, 1890)
- Species Calliotectum waitaraense (Marwick, 1926) †
- Genus Fusivoluta E. von Martens, 1902 (10)
- Genus Howellia Clench & Aguayo, 1941 accepted as Calliotectum Dall, 1890
- Genus Neptuneopsis G. B. Sowerby III, 1898 (1)
- Genus Pakaurangia H. J. Finlay, 1926 † accepted as Calliotectum Dall, 1890
- Genus Prodallia Bartsch, 1942 accepted as Calliotectum Dall, 1890
- Genus Teramachia Kuroda, 1931 accepted as Calliotectum Dall, 1890
- Subfamily Cymbiinae H. Adams & A. Adams, 1853 (1847) (236)
- Subfamily Cymbiolinae Bondarev, 1995 accepted as Melonini Pilsbry & Olsson, 1954
- Subfamily Eovolutinae Pacaud, 2016 † (25)
- Subfamily Fulgorariinae Pilsbry & Olsson, 1954 (57)
- Subfamily Indovolutinae Halder & S. S. Das, 2019 † (11)
- Subfamily Plicolivinae Bouchet, 1990 (2)
- Subfamily Scaphellinae Gray, 1857 (64)
- Subfamily Volutilithinae Pilsbry & Olsson, 1954 † (21)
- Subfamily Volutinae Rafinesque, 1815 (154)
- Subfamily Volutomitrinae J. E. Gray, 1854 accepted as Volutomitridae J. E. Gray, 1854
- Subfamily Zidoninae H. Adams & A. Adams, 1853 accepted as Zidonini H. Adams & A. Adams, 1853
- Genus Rostellites Conrad, 1855 †
- Genus Tectaplica Wade, 1916 †
- 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