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)
- Superfamily Olivoidea Latreille, 1825 (740)
- Family Ancillariidae Swainson, 1840 (299)
- Genus Alocospira Cossmann, 1899 (10)
- Genus Amalda H. Adams & A. Adams, 1853 (147)
- Genus Anaulax de Roissy, 1805 accepted as Ancilla Lamarck, 1799
- Genus Anbullina K. v. W. Palmer, 1937 † (2)
- Genus Ancilaria [sic] accepted as Ancillaria Lamarck, 1811
- Genus Ancilla Lamarck, 1799 (74)
- Genus Ancillaria Lamarck, 1811 accepted as Ancilla Lamarck, 1799 (1)
- Genus Ancillarina Bellardi, 1882 † (2)
- Genus Ancillina Bellardi, 1882 (8)
- Genus Ancillista Iredale, 1936 (11)
- Genus Ancillopsis Conrad, 1865 † (2)
- Genus Ancillus Montfort, 1810 accepted as Ancilla Lamarck, 1799
- Genus Anolacea accepted as Anolacia J. E. Gray, 1857
- Genus Anolacia J. E. Gray, 1857 (4)
- Genus Austrancilla Habe, 1959 accepted as Amalda H. Adams & A. Adams, 1853
- Genus Baryspira P. Fischer, 1883 accepted as Amalda (Baryspira) P. Fischer, 1883 (3)
- Subgenus Baryspira (Alocospira) Cossmann, 1899 accepted as Alocospira Cossmann, 1899
- Subgenus Baryspira (Gemaspira) O. P. Olson, 1956 † accepted as Amalda H. Adams & A. Adams, 1853
- Subgenus Baryspira (Gracilispira) O. P. Olson, 1956 † accepted as Amalda H. Adams & A. Adams, 1853
- Species Baryspira (Gracilispira) firthi O. P. Olson, 1956 † accepted as Amalda novaezelandiae (G. B. Sowerby II, 1859)
- Species Baryspira (Gracilispira) gigartoides O. P. Olson, 1956 † accepted as Amalda gigartoides (O. P. Olson, 1956) †
- Species Baryspira (Gracilispira) ligata (Tate, 1889) † accepted as Amalda (Baryspira) ligata (Tate, 1889) †
- Species Baryspira (Gracilispira) rimuensis O. P. Olson, 1956 † accepted as Amalda rimuensis (O. P. Olson, 1956) †
- Species Baryspira (Gracilispira) wairarapaensis O. P. Olson, 1956 † accepted as Amalda wairarapaensis (O. P. Olson, 1956) †
- Subgenus Baryspira (Pinguispira) H. J. Finlay, 1926 accepted as Amalda (Baryspira) P. Fischer, 1883
- Subgenus Baryspira (Spinaspira) O. P. Olson, 1956 accepted as Amalda H. Adams & A. Adams, 1853
- Species Baryspira australis (G. B. Sowerby I, 1830) accepted as Amalda australis (G. B. Sowerby I, 1830)
- Species Baryspira bathamae Dell, 1956 accepted as Amalda (Baryspira) bathamae (Dell, 1956)
- Species Baryspira bathami Dell, 1956 accepted as Amalda bathamae (Dell, 1956)
- Species Baryspira brevicula Marwick, 1931 † accepted as Amalda brevicula (Marwick, 1931) †
- Species Baryspira depressa (G. B. Sowerby II, 1859) accepted as Amalda depressa (G. B. Sowerby II, 1859)
- Species Baryspira electa Marwick, 1929 † accepted as Alocospira electa (Marwick, 1929) †
- Species Baryspira erica O. P. Olson, 1956 † accepted as Amalda (Baryspira) mucronata (G. B. Sowerby I, 1830)
- Species Baryspira exsputa Bartrum & A. W. B. Powell, 1928 † accepted as Amalda exsputa (Bartrum & A. W. B. Powell, 1928) †
- Species Baryspira fusiformis (Petterd, 1886) accepted as Amalda fusiformis (Petterd, 1886)
- Species Baryspira gladiolaria O. P. Olson, 1956 † accepted as Amalda (Baryspira) mucronata (G. B. Sowerby I, 1830)
- Species Baryspira gulosa C. A. Fleming, 1943 † accepted as Amalda gulosa (C. A. Fleming, 1943) †
- Species Baryspira lactea Kuroda, 1960 accepted as Amalda lactea (Kuroda, 1960)
- Species Baryspira lanceolata (Tate, 1889) †
- Species Baryspira longispira (Strebel, 1908) accepted as Micrancilla longispira (Strebel, 1908)
- Species Baryspira macbeathi Vella, 1954 † accepted as Amalda (Baryspira) macbeathi (Vella, 1954) †
- Species Baryspira mucronata (G. B. Sowerby I, 1830) accepted as Amalda mucronata (G. B. Sowerby I, 1830)
- Species Baryspira novaezelandiae (G. B. Sowerby II, 1859) accepted as Amalda (Gracilispira) novaezelandiae (G. B. Sowerby II, 1859)
- Species Baryspira oraria O. P. Olson, 1956 † accepted as Amalda (Baryspira) oraria (O. P. Olson, 1956) †
- Species Baryspira paeroa C. A. Fleming, 1943 † accepted as Alocospira paeroa (C. A. Fleming, 1943) †
- Species Baryspira parentalis Shikama & Oishi, 1977 accepted as Amalda parentalis (Shikama & Oishi, 1977)
- Species Baryspira platycephala A. W. B. Powell & Bartrum, 1929 † accepted as Amalda platycephala (A. W. B. Powell & Bartrum, 1929) †
- Species Baryspira pseudaustralis (Tate, 1889) †
- Species Baryspira southlandica C. A. Fleming, 1948 accepted as Amalda southlandica (C. A. Fleming, 1948)
- Species Baryspira tatei (Marwick, 1924) †
- Species Baryspira tholiculus Marwick, 1931 † accepted as Amalda tholiculus (Marwick, 1931) †
- Species Baryspira urasima Kira, 1959 accepted as Amalda hinomotoensis (Yokoyama, 1922)
- Species Baryspira utopica Kuroda MS accepted as Amalda utopica Ninomiya, 1987
- Species Baryspira waikaiaensis H. J. Finlay, 1926 † accepted as Amalda waikaiaensis (H. J. Finlay, 1926) †
- Genus Chilotygma H. Adams & A. Adams, 1853 accepted as Ancilla (Chilotygma) H. Adams & A. Adams, 1853
- Genus Dipsaccus H. Adams & A. Adams, 1853 accepted as Eburna Lamarck, 1801
- Genus Eburna Lamarck, 1801 (3)
- Genus Entomoliva Bouchet & Kilburn, 1991 (2)
- Genus Eoancilla Stephenson, 1941 † (4)
- Genus Gracilancilla Thiele, 1925 accepted as Ancillina Bellardi, 1882
- Genus Gracilispira Olsson, 1956 accepted as Amalda (Gracilispira) O. P. Olson, 1956
- Genus Hesperancilla Kilburn, 1981 accepted as Ancilla (Hesperancilla) Kilburn, 1981
- Genus Micrancilla P. A. Maxwell, 1992 (6)
- Genus Monoptygma I. Lea, 1833 † (1)
- Genus Olivula Conrad, 1832 † (1)
- Genus Palmoliva Allmon & Friend, 2023 † (2)
- Genus Sandella J. E. Gray, 1857 accepted as Amalda H. Adams & A. Adams, 1853
- Genus Sparella J. E. Gray, 1857 accepted as Ancilla (Sparella) J. E. Gray, 1857
- Genus Spirancilla H. E. Vokes, 1935 † (3)
- Genus Turrancilla E. von Martens, 1904 (13)
- Family Bellolividae Kantor, Fedosov, Puillandre, Bonillo & Bouchet, 2017 (22)
- Family Benthobiidae Kantor, Fedosov, Puillandre, Bonillo & Bouchet, 2017 (20)
- 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 (363)
- 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 † (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