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)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- 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 (3 198)
- Family Achatinellidae Gulick, 1873 (337)
- Family Agardhiellidae Harl & Páll-Gergely, 2017 (32)
- Family Amastridae Pilsbry, 1910 (318)
- Family Argnidae Hudec, 1965 (16)
- Family Cerastidae Wenz, 1923 (259)
- Genus Achatinelloides G. Nevill, 1878 (14)
- Genus Altenaia Zilch, 1972 (1)
- Genus Amimopina Solem, 1964 (2)
- Genus Amimopina Iredale, 1933 accepted as Amimopina Solem, 1964
- Genus Archeorachis Schileyko, 1998 accepted as Rhachistia Connolly, 1925
- Genus Cerastua Strand, 1928 accepted as Cerastus E. von Martens, 1860
- Genus Cerastus E. von Martens, 1860 (77)
- Subgenus Cerastus (Paracerastus) Thiele, 1934 accepted as Paracerastus Thiele, 1934
- Subgenus Cerastus (Petraeocerastus) Kobelt, 1902 accepted as Euryptyxis P. Fischer, 1883
- Subgenus Cerastus (Xerocerastus) Kobelt & Mollendorff, 1902 accepted as Xerocerastus Kobelt & Möllendorff, 1902
- Species Cerastus abbadianus (Bourguignat, 1883)
- Species Cerastus abyssinicus (L. Pfeiffer, 1845)
- Species Cerastus achatinoides Connolly, 1931
- Species Cerastus achilli (Bourguignat, 1883)
- Species Cerastus albidus Thiele, 1933
- Species Cerastus albonotatus (Verdcourt, 1974)
- Species Cerastus altus Thiele, 1933
- Species Cerastus alzonai Bacci, 1940
- Species Cerastus amaliae Kobelt, 1903
- Species Cerastus ambouliensis (Jousseaume, 1899)
- Species Cerastus antorinii (Pollonera, 1887)
- Species Cerastus bambuseti (E. von Martens, 1900)
- Subspecies Cerastus bambuseti bambuseti (E. von Martens, 1900)
- Subspecies Cerastus bambuseti kivuensis (Preston, 1913)
- Subspecies Cerastus bambuseti theeli (d'Ailly, 1910)
- Subspecies Cerastus bambuseti ukingensis (Kobelt, 1902) accepted as Cerastus bambuseti (E. von Martens, 1900)
- Species Cerastus baringi (Verdcourt, 1963)
- Species Cerastus bequaerti Pilsbry, 1919
- Species Cerastus boccardi (Pollonera, 1898)
- Species Cerastus boothi (Tomlin, 1910)
- Species Cerastus carolinae Kobelt, 1910
- Species Cerastus chefneuxi (Bourguignat, 1885)
- Species Cerastus corneus Thiele, 1933
- Species Cerastus daroliensis Kobelt, 1903
- Species Cerastus delicatula Preston, 1910
- Species Cerastus densus (L. Pfeiffer, 1856)
- Species Cerastus dinshawi Sykes, 1903 accepted as Euryptyxis latireflexa (Reeve, 1849)
- Species Cerastus distans (L. Pfeiffer, 1857)
- Species Cerastus drymaeoides (Thiele, 1911) accepted as Paracerastus drymaeoides (Thiele, 1911)
- Species Cerastus elatus Thiele, 1933
- Species Cerastus ellerbecki Kobelt, 1903
- Species Cerastus erlangeri Kobelt, 1901
- Species Cerastus fairbanki (L. Pfeiffer, 1857)
- Species Cerastus featheri (Tomlin, 1910)
- Species Cerastus flavicans (Van Goethem & Adam, 1978)
- Species Cerastus franzhuberi Thach, 2020
- Species Cerastus galinierianus (Bourguignat, 1883)
- Species Cerastus garamulatae Kobelt, 1901
- Species Cerastus girwanensis Connolly, 1941
- Species Cerastus habessinicus (Beck, 1837) accepted as Cerastus abyssinicus (L. Pfeiffer, 1845)
- Species Cerastus harrisii (Reeve, 1850)
- Species Cerastus hemprichi (Jickeli, 1874)
- Species Cerastus herbini (Bourguignat, 1883)
- Species Cerastus hyznyi Harzhauser & Neubauer, 2016 †
- Species Cerastus inflatus Thiele, 1933
- Species Cerastus jerdoni (Reeve, 1848)
- Species Cerastus jickelianus (G. Nevill, 1878)
- Species Cerastus kellaensis Thiele, 1933
- Species Cerastus kempi Preston, 1913
- Species Cerastus kivuensis Preston, 1913 accepted as Cerastus bambuseti kivuensis (Preston, 1913)
- Species Cerastus lucasi Pilsbry, 1919
- Species Cerastus lycanianus (Innes, 1884)
- Species Cerastus lymnaeiformis F. Haas, 1936
- Species Cerastus maharasicus (Bourguignat, 1876) accepted as Pupoides coenopictus (T. Hutton, 1834)
- Species Cerastus major [sic] † accepted as Cerastus miocenicus var. majus Verdcourt, 1963 †
- Species Cerastus malabaricus (L. Pfeiffer, 1857)
- Species Cerastus malleatus Kobelt, 1901
- Species Cerastus miocenicus Verdcourt, 1963 †
- Species Cerastus moellendorffi Kobelt, 1903
- Species Cerastus moussonianus (Petit de la Saussaye, 1851)
- Species Cerastus neumanni Kobelt, 1901
- Species Cerastus nobilis Preston, 1911 accepted as Cerastus roosevelti (Dall, 1910)
- Species Cerastus olivieri (L. Pfeiffer, 1857)
- Species Cerastus partulaeformis Preston, 1913
- Species Cerastus plicatus Thiele, 1933
- Species Cerastus praeinsularis Neubert & Van Damme, 2012 †
- Species Cerastus procrastinationis (van Bruggen, 1993)
- Species Cerastus pseudoena Neubert & Van Damme, 2012 †
- Species Cerastus putealis Connolly, 1930
- Species Cerastus raffrayi (Bourguignat, 1883)
- Species Cerastus regalis Thiele, 1933
- Species Cerastus retirugis (E. von Martens, 1895) accepted as Cerastus trapezoideus trapezoideus (E. von Martens, 1892)
- Species Cerastus retivugis (E. von Martens, 1895) accepted as Cerastus trapezoideus trapezoideus (E. von Martens, 1892)
- Species Cerastus roosevelti (Dall, 1910)
- Species Cerastus rothschildianus (H. Neuville & R. Anthony, 1905)
- Species Cerastus rueppellianus Kobelt, 1901
- Species Cerastus sacconii (Pollonera, 1888)
- Species Cerastus schweinfurthi (E. von Martens, 1895)
- Species Cerastus scioanus (Pollonera, 1888)
- Species Cerastus scotti Connolly, 1941
- Species Cerastus segregatus (Reeve, 1849)
- Species Cerastus simonis (Bourguignat, 1883)
- Species Cerastus soleilleti (Bourguignat, 1885)
- Species Cerastus somaliensis (E. A. Smith, 1899)
- Species Cerastus stilifer Thiele, 1933
- Species Cerastus tamisierianus (Bourguignat, 1883)
- Species Cerastus tenuidecussatus (Verdcourt, 1970)
- Species Cerastus trapezoideus (E. von Martens, 1892)
- Species Cerastus upembae (Van Goethem & Adam, 1978)
- Species Cerastus vexillum (Thiele, 1911)
- Species Cerastus vigonii (Pollonera, 1888)
- Genus Conulinus E. von Martens, 1895 (9)
- Genus Darwininitium Budha & Mordan, 2012 accepted as Ganesella W. T. Blanford, 1863
- Genus Edouardia Gude, 1914 accepted as Conulinus E. von Martens, 1895
- Genus Eorrhachis Tomlin & Peile, 1930 accepted as Rhachistia Connolly, 1925
- Genus Euryptyxis P. Fischer, 1883 (14)
- Genus Gittenedouardia Bank & Menkhorst, 2008 (35)
- Genus Helenopachnodus Germain, 1931 accepted as Nesobia Ancey, 1887
- Genus Hoqia Neubert, 2005 (1)
- Genus Limicena Connolly, 1925 (1)
- Genus Microscintilla Neubert, 2002 (3)
- Genus Nesiocerastus Van Mol & Coppois, 1980 (8)
- Genus Nesobia Ancey, 1887 accepted as Chilonopsis Fischer von Waldheim, 1848
- Genus Ovella L. Pfeiffer, 1879 accepted as Achatinelloides G. Nevill, 1878
- Genus Pachnodus E. von Martens, 1860 (5)
- Genus Paracerastus Thiele, 1934 (1)
- Genus Passamaella L. Pfeiffer, 1878 (10)
- Genus Pleurorhachis Connolly, 1939 (1)
- Genus Polychordia Connolly, 1941 (1)
- Genus Rachidinia accepted as Rhachidina Thiele, 1911
- Genus Rachis Albers, 1850 (22)
- Genus Rachisellus Bourguignat, 1890 accepted as Rachis Albers, 1850
- Genus Rachispeculum Iredale, 1933 (1)
- Genus Rachistia [sic] accepted as Rhachistia Connolly, 1925
- Genus Rhachidina Thiele, 1911 (2)
- Genus Rhachis Connolly, 1925 accepted as Rachis Albers, 1850
- Genus Rhachistia Connolly, 1925 (31)
- Genus Soqena Neubert, 2005 (10)
- Genus Zebrinops Thiele, 1931 (10)
- 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) (687)
- Family Fauxulidae Harl & Páll-Gergely, 2017 (21)
- Family Gastrocoptidae Pilsbry, 1918 (491)
- Family Hypselostomatidae Zilch, 1959 accepted as Hypselostomatinae Zilch, 1959
- 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 (581)
- 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 (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- 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 (1 034)
- 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
