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- Mollusca (133 221)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 077)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 971)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 793)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 217)
- Infraclass "Lower Heterobranchia" (1 139)
- Infraclass Euthyneura (37 492)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 164)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 623)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 820)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 668)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 698)
- Infraorder Limacoidei (4 247)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 466)
- Superfamily Achatinelloidea Gulick, 1873 accepted as Pupilloidea W. Turton, 1831
- Superfamily Azecoidea H. Watson, 1920 (44)
- Superfamily Chondrinoidea Steenberg, 1925 (183)
- Superfamily Cionelloidea L. Pfeiffer, 1879 accepted as Cochlicopoidea Pilsbry, 1900 (1879)
- Superfamily Cochlicopoidea Pilsbry, 1900 (1879) accepted as Pupilloidea W. Turton, 1831
- Superfamily Dendropupoidea Wenz, 1938 † (11)
- Superfamily Enoidea B. B. Woodward, 1903 (1880) accepted as Pupilloidea W. Turton, 1831
- Superfamily Orculoidea Pilsbry, 1918 accepted as Pupilloidea W. Turton, 1831
- Superfamily Partuloidea Pilsbry, 1900 accepted as Pupilloidea W. Turton, 1831
- Superfamily Pupilloidea W. Turton, 1831 (3 228)
- Family Achatinellidae Gulick, 1873 (337)
- Family Agardhiellidae Harl & Páll-Gergely, 2017 (32)
- Family Amastridae Pilsbry, 1910 (318)
- Subfamily Amastrinae Pilsbry, 1910 (187)
- Genus Amastra H. Adams & A. Adams, 1855 (144)
- Subgenus Amastra (Amastra) H. Adams & A. Adams, 1855 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Amastrella) Sykes, 1900 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Armiella) Hyatt, 1911 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Cyclamastra) Pilsbry & Vanatta, 1905 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Helicamastra) Pilsbry & Vanatta, 1905 accepted as Tropidoptera Ancey, 1889
- Subgenus Amastra (Heteramastra) Pilsbry, 1911 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Kauaia) Sykes, 1900 represented as Amastra H. Adams & A. Adams, 1855
- Subgenus Amastra (Laminella) L. Pfeiffer, 1854 accepted as Laminella L. Pfeiffer, 1854
- Subgenus Amastra (Metamastra) Hyatt & Pilsbry, 1911 represented as Amastra H. Adams & A. Adams, 1855
- Species Amastra (Metamastra) aemulator Hyatt & Pilsbry, 1911 represented as Amastra aemulator Hyatt & Pilsbry, 1911
- Species Amastra (Metamastra) albolabris (Newcomb, 1854) represented as Amastra albolabris (Newcomb, 1854)
- Species Amastra (Metamastra) badia (Baldwin, 1895) represented as Amastra badia (Baldwin, 1895)
- Species Amastra (Metamastra) breviata (Baldwin, 1895) represented as Amastra breviata (Baldwin, 1895)
- Species Amastra (Metamastra) caputadamantis Hyatt & Pilsbry, 1911 represented as Amastra caputadamantis Hyatt & Pilsbry, 1911
- Species Amastra (Metamastra) cookei Hyatt & Pilsbry, 1911 accepted as Amastra textilis (Quoy & Gaimard, 1825)
- Species Amastra (Metamastra) cornea (Newcomb, 1854) represented as Amastra cornea (Newcomb, 1854)
- Species Amastra (Metamastra) crassilabrum (Newcomb, 1854) represented as Amastra crassilabrum (Newcomb, 1854)
- Species Amastra (Metamastra) davisiana C. M. Cooke, 1908 represented as Amastra davisiana C. M. Cooke, 1908
- Species Amastra (Metamastra) eos Pilsbry & C. M. Cooke, 1914 represented as Amastra eos Pilsbry & C. M. Cooke, 1914
- Species Amastra (Metamastra) forbesi C. M. Cooke, 1917 represented as Amastra forbesi C. M. Cooke, 1917
- Species Amastra (Metamastra) gulickiana Hyatt & Pilsbry, 1911 represented as Amastra gulickiana Hyatt & Pilsbry, 1911
- Species Amastra (Metamastra) irwiniana C. M. Cooke, 1908 represented as Amastra irwiniana C. M. Cooke, 1908
- Species Amastra (Metamastra) montagui Pilsbry, 1913 represented as Amastra montagui Pilsbry, 1913
- Species Amastra (Metamastra) montivaga C. M. Cooke, 1917 represented as Amastra montivaga C. M. Cooke, 1917
- Species Amastra (Metamastra) oswaldi C. M. Cooke, 1933 represented as Amastra oswaldi C. M. Cooke, 1933
- Species Amastra (Metamastra) paulula C. M. Cooke, 1917 represented as Amastra paulula C. M. Cooke, 1917
- Species Amastra (Metamastra) pellucida (Baldwin, 1895) represented as Amastra pellucida (Baldwin, 1895)
- Species Amastra (Metamastra) praeopima C. M. Cooke, 1917 represented as Amastra praeopima C. M. Cooke, 1917
- Species Amastra (Metamastra) reticulata (Newcomb, 1854) represented as Amastra reticulata (Newcomb, 1854)
- Species Amastra (Metamastra) sericea (L. Pfeiffer, 1859) represented as Amastra sericea (L. Pfeiffer, 1859)
- Subspecies Amastra (Metamastra) sericea anaglypta C. M. Cooke, 1917 represented as Amastra sericea anaglypta C. M. Cooke, 1917
- Subspecies Amastra (Metamastra) sericea sericea (L. Pfeiffer, 1859) represented as Amastra sericea sericea (L. Pfeiffer, 1859)
- Variety Amastra (Metamastra) sericea var. anaglypta C. M. Cooke, 1917 accepted as Amastra (Metamastra) sericea anaglypta C. M. Cooke, 1917
- Species Amastra (Metamastra) spaldingi C. M. Cooke, 1908 represented as Amastra spaldingi C. M. Cooke, 1908
- Species Amastra (Metamastra) subcornea Hyatt & Pilsbry, 1911 represented as Amastra subcornea Hyatt & Pilsbry, 1911
- Species Amastra (Metamastra) subrostrata (L. Pfeiffer, 1859) represented as Amastra subrostrata (L. Pfeiffer, 1859)
- Species Amastra (Metamastra) textilis (Quoy & Gaimard, 1825) represented as Amastra textilis (Quoy & Gaimard, 1825)
- Species Amastra (Metamastra) thaamuni Hyatt & Pilsbry, 1911 represented as Amastra thaamuni Hyatt & Pilsbry, 1911
- Species Amastra (Metamastra) transversalis (L. Pfeiffer, 1856) represented as Amastra transversalis (L. Pfeiffer, 1856)
- Species Amastra (Metamastra) undata (Baldwin, 1895) represented as Amastra undata (Baldwin, 1895)
- Species Amastra (Metamastra) vetusta (Baldwin, 1895) represented as Amastra vetusta (Baldwin, 1895)
- Subgenus Amastra (Paramastra) Hyatt & Pilsbry, 1911 represented as Amastra H. Adams & A. Adams, 1855
- Species Amastra abavus Hyatt & Pilsbry, 1911 †
- Species Amastra acuta (Swainson, 1828) accepted as Amastra spirizona (Quoy & Gaimard, 1825)
- Species Amastra aemulator Hyatt & Pilsbry, 1911
- Species Amastra affinis (Newcomb, 1854)
- Species Amastra agglutinans (Newcomb, 1854)
- Species Amastra albocincta Pilsbry & C. M. Cooke, 1914
- Species Amastra albolabris (Newcomb, 1854)
- Species Amastra amboinensis E. A. Smith, 1873
- Species Amastra amicta E. A. Smith, 1873
- Species Amastra anaglypta C. M. Cooke, 1917 accepted as Amastra sericea anaglypta C. M. Cooke, 1917
- Species Amastra anthonii (Newcomb, 1861)
- Species Amastra antiqua (Baldwin, 1895)
- Species Amastra assimilis (Newcomb, 1854)
- Species Amastra aurostoma Baldwin, 1896
- Species Amastra badia (Baldwin, 1895)
- Species Amastra baldwiniana Hyatt & Pilsbry, 1911
- Species Amastra bigener Hyatt, 1911 accepted as Amastra affinis (Newcomb, 1854)
- Species Amastra biplicata (Newcomb, 1854)
- Species Amastra borcherdingi Hyatt & Pilsbry, 1911
- Species Amastra breviata (Baldwin, 1895)
- Species Amastra caputadamantis Hyatt & Pilsbry, 1911
- Species Amastra carinata Gulick, 1873 accepted as Amastra agglutinans (Newcomb, 1854)
- Species Amastra citrea Sykes, 1896 accepted as Amastra mucronata citrea Sykes, 1896
- Species Amastra conica Baldwin, 1906
- Species Amastra conicospira E. A. Smith, 1873 accepted as Amastra cylindrica (Newcomb, 1854)
- Species Amastra conifera E. A. Smith, 1873
- Species Amastra cookei Hyatt & Pilsbry, 1911 accepted as Amastra textilis (Quoy & Gaimard, 1825)
- Species Amastra cornea (Newcomb, 1854)
- Species Amastra crassilabrum (Newcomb, 1854)
- Species Amastra cyclostoma (Baldwin, 1895)
- Species Amastra cylindrica (Newcomb, 1854)
- Species Amastra davisiana C. M. Cooke, 1908
- Species Amastra decorticata Gulick, 1873
- Species Amastra delicata C. M. Cooke, 1933
- Species Amastra deshaysii (Morelet, 1857) accepted as Amastra assimilis (Newcomb, 1854)
- Species Amastra durandi Ancey, 1897
- Species Amastra dwightii C. M. Cooke, 1933
- Species Amastra elegantula Hyatt & Pilsbry, 1911
- Species Amastra elephantina C. M. Cooke, 1917
- Species Amastra elliptica Gulick, 1873
- Species Amastra elongata (Newcomb, 1853)
- Species Amastra eos Pilsbry & C. M. Cooke, 1914
- Species Amastra extincta (L. Pfeiffer, 1856)
- Species Amastra flavescens (Newcomb, 1854)
- Species Amastra flemingi C. M. Cooke, 1917 †
- Species Amastra forbesi C. M. Cooke, 1917
- Species Amastra fossilis Baldwin, 1903
- Species Amastra fragilis Pilsbry & C. M. Cooke, 1914
- Species Amastra fragosa C. M. Cooke, 1917
- Species Amastra fraterna Sykes, 1896
- Species Amastra frosti Ancey, 1892 accepted as Amastra micans (L. Pfeiffer, 1859)
- Species Amastra globosa C. M. Cooke, 1933 †
- Species Amastra goniops Pilsbry & C. M. Cooke, 1914
- Species Amastra gouveii C. M. Cooke, 1917
- Species Amastra grayana (L. Pfeiffer, 1856)
- Species Amastra gulickiana Hyatt & Pilsbry, 1911
- Species Amastra hawaiiensis Hyatt & Pilsbry, 1911
- Species Amastra heliciformis Ancey, 1890 accepted as Tropidoptera heliciformis (Ancey, 1890)
- Species Amastra henshawi Baldwin, 1903 accepted as Amastra flavescens henshawi Baldwin, 1903
- Species Amastra hitchcocki C. M. Cooke, 1917
- Species Amastra humilis (Newcomb, 1855)
- Species Amastra hutchinsonii (Pease, 1862)
- Species Amastra implicata C. M. Cooke, 1933
- Species Amastra inflata (L. Pfeiffer, 1856)
- Species Amastra inopinata C. M. Cooke, 1933
- Species Amastra irwiniana C. M. Cooke, 1908
- Species Amastra johnsoni Hyatt & Pilsbry, 1911
- Species Amastra juddii C. M. Cooke, 1917
- Species Amastra kalamaulensis Pilsbry & C. M. Cooke, 1914
- Species Amastra kauaiensis (Newcomb, 1860)
- Species Amastra kaunakakaiensis Pilsbry & C. M. Cooke, 1914
- Species Amastra knudsenii (Baldwin, 1895)
- Species Amastra kuhnsi Cooke, 1908 accepted as Laminella kuhnsi (C. M. Cooke, 1908)
- Species Amastra laeva Baldwin, 1906
- Species Amastra lahainana Pilsbry & C. M. Cooke, 1914
- Species Amastra lineolata (Newcomb, 1853)
- Species Amastra longa Sykes, 1896
- Species Amastra luctuosa (L. Pfeiffer, 1856)
- Species Amastra luteola (A. Férussac, 1825)
- Species Amastra magna (C. B. Adams, 1851)
- Species Amastra makawaoensis Hyatt & Pilsbry, 1911
- Species Amastra malleata E. A. Smith, 1873
- Species Amastra mastersi (Newcomb, 1854)
- Species Amastra melanosis (Newcomb, 1854)
- Species Amastra metamorpha Pilsbry & C. M. Cooke, 1914
- Species Amastra micans (L. Pfeiffer, 1859)
- Species Amastra mirabilis C. M. Cooke, 1917
- Species Amastra modesta (C. B. Adams, 1851)
- Species Amastra modicella C. M. Cooke, 1917
- Species Amastra moesta (Newcomb, 1854)
- Species Amastra montagui Pilsbry, 1913
- Species Amastra montana Baldwin, 1906
- Species Amastra montivaga C. M. Cooke, 1917
- Species Amastra morticina Hyatt & Pilsbry, 1911
- Species Amastra mucronata (Newcomb, 1853)
- Species Amastra nana (Baldwin, 1895)
- Species Amastra nannodes C. M. Cooke, 1933
- Species Amastra neglecta Pilsbry & C. M. Cooke, 1914
- Species Amastra nigra (Newcomb, 1855)
- Species Amastra nigrolabris E. A. Smith, 1873 accepted as Amastra spirizona nigrolabris E. A. Smith, 1873
- Species Amastra nubifera Hyatt & Pilsbry, 1911
- Species Amastra nubigena Pilsbry & C. M. Cooke, 1914
- Species Amastra nubilosa (Mighels, 1845)
- Species Amastra nucleola (A. Gould, 1845)
- Species Amastra nucula E. A. Smith, 1873
- Species Amastra obesa (Newcomb, 1853)
- Species Amastra oswaldi C. M. Cooke, 1933
- Species Amastra ovatula C. M. Cooke, 1933 †
- Species Amastra pagodula C. M. Cooke, 1917
- Species Amastra paulula C. M. Cooke, 1917
- Species Amastra peasei E. A. Smith, 1873
- Species Amastra pellucida (Baldwin, 1895)
- Species Amastra perversa Hyatt & Pilsbry, 1911
- Species Amastra petricola (Newcomb, 1855)
- Species Amastra pilsbryi C. M. Cooke, 1913
- Species Amastra porcus Hyatt & Pilsbry, 1911
- Species Amastra porphyrostoma (Pease, 1869)
- Species Amastra praeopima C. M. Cooke, 1917
- Species Amastra problematica C. M. Cooke, 1933
- Species Amastra pullata (Baldwin, 1895)
- Species Amastra pusilla (Newcomb, 1855)
- Species Amastra reticulata (Newcomb, 1854)
- Species Amastra ricei C. M. Cooke, 1917
- Species Amastra rubens (A. Gould, 1845)
- Species Amastra rubida Gulick, 1873
- Species Amastra rubristoma Baldwin, 1906
- Species Amastra rugulosa Pease, 1870
- Species Amastra rustica Gulick, 1873 accepted as Amastra affinis (Newcomb, 1854)
- Species Amastra saxicola Baldwin, 1903 accepted as Amastra flavescens saxicola Baldwin, 1903
- Species Amastra seminigra Hyatt & Pilsbry, 1911
- Species Amastra seminuda Baldwin, 1906
- Species Amastra senilis Baldwin, 1903
- Species Amastra sericea (L. Pfeiffer, 1859)
- Species Amastra similaris Pease, 1870
- Species Amastra simularis W. D. Hartman, 1888 accepted as Amastra mucronata (Newcomb, 1853)
- Species Amastra sinistrorsa Baldwin, 1906
- Species Amastra sola Hyatt & Pilsbry, 1911
- Species Amastra soror (Newcomb, 1854)
- Species Amastra spaldingi C. M. Cooke, 1908
- Species Amastra sphaerica Pease, 1870
- Species Amastra spicula C. M. Cooke, 1917
- Species Amastra spirizona (Quoy & Gaimard, 1825)
- Species Amastra subcornea Hyatt & Pilsbry, 1911
- Species Amastra subcrassilabris Hyatt & Pilsbry, 1911
- Species Amastra subobscura Hyatt & Pilsbry, 1911
- Species Amastra subrostrata (L. Pfeiffer, 1859)
- Species Amastra subsoror Hyatt & Pilsbry, 1911
- Species Amastra sykesi Hyatt & Pilsbry, 1911
- Species Amastra tenuilabris Gulick, 1873
- Species Amastra tenuispira (Baldwin, 1895)
- Species Amastra textilis (Quoy & Gaimard, 1825)
- Species Amastra thaamuni Hyatt & Pilsbry, 1911
- Species Amastra thurstoni C. M. Cooke, 1917
- Species Amastra transversalis (L. Pfeiffer, 1856)
- Species Amastra tricincta Hyatt & Pilsbry, 1911
- Species Amastra tristis (Quoy & Gaimard, 1825)
- Species Amastra turritella (A. Férussac, 1821)
- Species Amastra ultima Pilsbry & C. M. Cooke, 1914
- Species Amastra umbilicata (L. Pfeiffer, 1856)
- Species Amastra undata (Baldwin, 1895)
- Species Amastra uniplicata (W. D. Hartman, 1888)
- Species Amastra variegata (L. Pfeiffer, 1849)
- Species Amastra vetusta (Baldwin, 1895)
- Species Amastra villosa Sykes, 1896 accepted as Amastra hutchinsonii (Pease, 1862)
- Species Amastra violacea (Newcomb, 1853)
- Species Amastra viriosa C. M. Cooke, 1917
- Species Amastra whitei C. M. Cooke, 1917
- Genus Amastrella Sykes, 1900 accepted as Amastra (Amastrella) Sykes, 1900
- Genus Armiella Hyatt, 1911 accepted as Amastra (Armiella) Hyatt, 1911
- Genus Carelia H. Adams & A. Adams, 1855 (21)
- Genus Cyclamastra Pilsbry & Vanatta, 1905 accepted as Amastra (Cyclamastra) Pilsbry & Vanatta, 1905
- Genus Heteramastra Pilsbry, 1911 accepted as Amastra (Heteramastra) Pilsbry, 1911
- Genus Kauaia Sykes, 1900 accepted as Amastra (Kauaia) Sykes, 1900
- Genus Laminella L. Pfeiffer, 1854 (14)
- Genus Metamastra Hyatt & Pilsbry, 1911 accepted as Amastra (Metamastra) Hyatt & Pilsbry, 1911
- Genus Paramastra Hyatt & Pilsbry, 1911 accepted as Amastra (Paramastra) Hyatt & Pilsbry, 1911
- Genus Planamastra Hyatt & Pilsbry, 1911 (3)
- Genus Pterodiscus Pilsbry, 1893 accepted as Tropidoptera Ancey, 1889
- Genus Tropidoptera Ancey, 1889 (5)
- Subfamily Leptachatininae T. D. A. Cockerell, 1913 (131)
- Family Argnidae Hudec, 1965 (16)
- Family Cerastidae Wenz, 1923 (259)
- Family Cerastuidae Wenz, 1930 accepted as Cerastidae Wenz, 1923
- Family Chondrulidae A. J. Wagner, 1928 accepted as Chondrulini Wenz, 1923
- Family Cionellidae L. Pfeiffer, 1879 accepted as Cochlicopidae Pilsbry, 1900 (1879)
- Family Cochlicopidae Pilsbry, 1900 (1879) (22)
- Family Cylindrovertillidae Iredale, 1940 accepted as Nesopupinae Steenberg, 1925
- Family Draparnaudiidae Solem, 1962 (6)
- Family Elasmiatidae Kuroda & T. Habe, 1949 accepted as Elasmiatini Kuroda & T. Habe, 1949
- Family Enidae B. B. Woodward, 1903 (1880) (688)
- Family Fauxulidae Harl & Páll-Gergely, 2017 (21)
- Family Gastrocoptidae Pilsbry, 1918 (207)
- Family Hypselostomatidae Zilch, 1959 (313)
- Family Lauriidae Steenberg, 1925 (92)
- Family Odontocycladidae Hausdorf, 1996 (2)
- Family Orculidae Pilsbry, 1918 (85)
- Family Pachnodidae Steenberg, 1925 accepted as Cerastidae Wenz, 1923
- Family Pacificellidae Steenberg, 1925 accepted as Pacificellinae Steenberg, 1925
- Family Pagodulinidae Pilsbry, 1924 (12)
- Family Partulidae Pilsbry, 1900 (106)
- Family Pleurodiscidae Wenz, 1923 (11)
- Family Pupidae J. Fleming, 1822 accepted as Cerionidae Pilsbry, 1901
- Family Pupillidae W. Turton, 1831 (140)
- Family Pupisomatidae Iredale, 1940 accepted as Valloniidae E. S. Morse, 1864
- Family Pupoididae Iredale, 1939 accepted as Pupoidinae Iredale, 1939
- Family Pyramidulidae Kennard & B. B. Woodward, 1914 (19)
- Family Spelaeoconchidae A. J. Wagner, 1928 (1)
- Family Spelaeodiscidae Steenberg, 1925 (23)
- Family Strobilidae Jooss, 1911 accepted as Strobilopsidae Wenz, 1915
- Family Strobilopsidae Wenz, 1915 (85)
- Family Tornatellinidae Sykes, 1900 accepted as Tornatellininae Sykes, 1900
- Family Valloniidae E. S. Morse, 1864 (128)
- Family Vertiginidae Fitzinger, 1833 (305)
- Family Zuidae Bourguignat, 1884 accepted as Cochlicopidae Pilsbry, 1900 (1879)
- Superfamily Vertiginoidea Fitzinger, 1833 accepted as Pupilloidea W. Turton, 1831
- Infraorder Rhytidoidei (580)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- Superorder Hygrophila (2 009)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 284)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- 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 (1 036)
- 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 (1 915)
- 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
