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)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Superorder Hygrophila (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Siphonariida (163)
- Superfamily Siphonarioidea Gray, 1827 (163)
- Family Acroreiidae Cossmann, 1893 † (1)
- Family Anisomyonidae Kanie, 1975 † accepted as Siphonariidae J. E. Gray, 1827 (3)
- Family Liriolidae A. N. Golikov & Kussakin, 1978 accepted as Siphonariidae J. E. Gray, 1827
- Family Siphonacmeidae Starobogatov, 1976 accepted as Siphonariidae J. E. Gray, 1827
- Family Siphonariidae J. E. Gray, 1827 (159)
- Genus Allerya Mörch, 1877 accepted as Williamia Monterosato, 1884
- Genus Anthosiphonaria Kuroda & T. Habe, 1971 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Aporemodon G. C. Robson, 1913 (1)
- Genus Benhamina H. J. Finlay, 1926 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Brondelia Bourguignat, 1862 accepted as Williamia Monterosato, 1884
- Genus Ductosiphonaria Hubendick, 1945 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Ellsiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Hebesiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Heterosiphonaria Hubendick, 1945 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Hubendickula McAlpine, 1952 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Kerguelenella A. W. B. Powell, 1946 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Kerguelenia Mabille & Rochebrune, 1889 accepted as Kerguelenella A. W. B. Powell, 1946
- Genus Legosiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Liriola Dall, 1870 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Mallorisiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Mestosiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Mouretus Blainville, 1825 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Pachysiphonaria Hubendick, 1945 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Parascutum Cossmann, 1890 accepted as Williamia Monterosato, 1884
- Genus Parellsiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Patellopsis Nobre, 1886 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Planesiphon Zilch, 1959 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Planesiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Pseudohercynella Kaunhowen, 1898 †
- Genus Pugillaria Iredale, 1924 accepted as Siphonaria G. B. Sowerby I, 1823
- Species Pugillaria emergens B. W. Jenkins, 2018 accepted as Siphonaria emergens (B. W. Jenkins, 2018)
- Species Pugillaria oblia B. W. Jenkins, 2018 accepted as Siphonaria oblia (B. W. Jenkins, 2018)
- Species Pugillaria stowae (Verco, 1906) accepted as Siphonaria stowae Verco, 1906
- Subspecies Pugillaria stowae comita Iredale, 1924 accepted as Siphonaria stowae Verco, 1906
- Genus Roya Iredale, 1912 accepted as Williamia Monterosato, 1884
- Genus Scutulum Monterosato, 1877 accepted as Williamia Monterosato, 1884
- Genus Simplisiphonaria Hubendick, 1945 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Siphonacmaea [sic] accepted as Siphonacmea Habe, 1958
- Genus Siphonacmea Habe, 1958 (1)
- Genus Siphonaria G. B. Sowerby I, 1823 (146)
- Genus Talisiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Torquisiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Triellsiphon Iredale, 1940 accepted as Siphonaria G. B. Sowerby I, 1823
- Genus Williamia Monterosato, 1884 (11)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- 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