Between brackets is the number of accepted species

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- Mollusca (133 313)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 086)
- Class Caudofoveata (143)
- Class Cephalopoda (1 921)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 049)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 849)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 722)
- Order Littorinimorpha (17 231)
- 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)
- Family Ancillariidae Swainson, 1840 (299)
- Family Bellolividae Kantor, Fedosov, Puillandre, Bonillo & Bouchet, 2017 (22)
- Family Benthobiidae Kantor, Fedosov, Puillandre, Bonillo & Bouchet, 2017 (20)
- Genus Benthobia Dall, 1889 (5)
- Genus Fusulculus Bouchet & Vermeij, 1998 (15)
- Species Fusulculus albus Bouchet & Vermeij, 1998
- Species Fusulculus alienopriscus Pacaud & Tracey, 2000 †
- Species Fusulculus antiquus (G. Vincent, 1878) †
- Species Fusulculus crenatus Bouchet & Vermeij, 1998
- Species Fusulculus curryi Pacaud & Tracey, 2000 †
- Species Fusulculus hanseni Pacaud, 2020 †
- Species Fusulculus koeneni (Ravn, 1939) †
- Species Fusulculus mcnairyensis (Wade, 1917) †
- Species Fusulculus multinodulosus (Vermeij, 1998) †
- Species Fusulculus nanapullus Pacaud & Schnetler, 1999 †
- Species Fusulculus nodulosus (Beyrich, 1854) †
- Species Fusulculus perminutus (Cossmann, 1923) †
- Species Fusulculus priscus (Deshayes, 1862) †
- Species Fusulculus pusillus (Beyrich, 1854) †
- Species Fusulculus rosenkrantzi (Traub, 1979) †
- Genus Nux Barnard, 1960 accepted as Benthobia Dall, 1889
- Family Dactylidae H. Adams & A. Adams, 1853 accepted as Olivinae Latreille, 1825
- Family Olivancillariidae A. N. Golikov & Starobogatov, 1975 accepted as Olivancillariinae A. N. Golikov & Starobogatov, 1975
- Family Olivellidae Troschel, 1869 accepted as Olivellinae Troschel, 1869
- Family Olividae Latreille, 1825 (364)
- Family Pseudolividae De Gregorio, 1880 (36)
- Family Zemiridae Iredale, 1924 accepted as Pseudolividae De Gregorio, 1880
- Subfamily Dipsaccinae P. Fischer, 1884 accepted as Ancillariidae Swainson, 1840
- Subfamily Vanpalmeriinae Adegoke, 1977 † accepted as Ancillariidae Swainson, 1840
- 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)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 231)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (517)
- 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 (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata